I think it would make more sense if Western Focus didn't automatically make you western, but rather opened up the Westernization option regardless of neighboring country or tech gap, or gave you some kind of discount on Westernization. Then it wouldn't really matter how "easy " it is to get to a Western province, because the prize wouldn't be quite as sweet.
I'm also not swayed by the arguments that Rome would be "too easy" to get, as compared to other provinces. Strange things can happen in-game. Who says Vienna/Madrid/Paris are owned by major powers by the time your nation gets there? Who says 2000 development France doesn't own Rome? The point is that you take a province that is deeply part of the Western tradition and that gives your nation insight into Western civilization. Rome would be a perfect candidate.
The problem with westernization is that even with a discount, the process is just not that cost effective for Eastern or Anatolian nations. 2400 points up front is a lot. Even half of that is huge. Figure it this way. You are going to get a max of 22 techs more. That gives you net gain for Anatolian of 3300 points per tech group. Isn't this a good investment, I mean you have a 8:1 return rate? Well you also have to look at the opportunity cost. Getting behind in tech by tech 10 means you have to forgo some nice opportunities - the big jumps that occur in the first few mil techs, getting national ideas rolling, or getting range to dominate trade and colonization. Worse, you take a lot of hits during Westernization - 3 stab off the top is easily a couple of hundred points, yearly pulses for any decent sized empire will likely be another couple of hundred lost points, and the combination of rebels & more expensive advisers may well force you to drop a level in one or more slots (going from say a lvl 2 to a lvl 1 for 10 years is 120 points gone) - all of this adds up and makes that 8:1 return drop down to 4 or 3:1.
Worse this is a huge amount of early points to gain back some more late points. And it is not like the last few techs are game shattering. The last 3 admin techs just bring production and government forms that while nice, are not strictly needed. If you are willing to skip idea #8, then you can skip another 2 levels of admin. On the Dip side, it is money & naval morale with a +50 settler bonus after tech 26. Yeah, there is some value in having higher dip tech to avoid subject malus, but cutting out a few levels here is much easier than westernizing. Mil, well the last two levels are just bonuses to shock, fire & supply which are nice ... but not that necessary if your main foes at that point are rebels.
Even if the points became convincing, you still have a pretty sizeable downtime where you can't expand thanks to the +RR and the need to hold points for Westernizing. The process of Westernization itself is just too huge of a major punishment.
Westernization just isn't that good of a deal for Eastern and Anatolian. When I did my world conversion run with Ottomans, it was never worth it to consider westernizing. Why on earth would I go pick a fight with Austria and spend a lot of my AE and OExt margins in the early game for something of dubious value?
I really like that there is a big prize for fighting the major powers in heavily contested areas. The game needs to get back towards having high risk & high reward setups. Not a steady recycling of the same strategic objectives ad naseum.
Who says the provinces won't be taken? Well Rome is an obvious case as there is this magical event which restores the Pope there that I have
never seen the AI not do in spite consoling a bunch of crap. You pretty much need to have the AI be non-Catholic to have Rome be held by a major. That can happen ... but it is unlikely. Further I specifically noted that what is important is the starting setup. As Karamon it doesn't matter if France might somehow chew through Provence, Savoy, Genoa, and finally the Pope through a series of claims & missions. By that time I can very easily have Rome cored, sporting the max fort, and possibly converted to Sunni.
Who says Paris/Wien/Madrid are owned by the majors? Nobody. Who says that the majors, whoever they are, will have an interest in those cities? Everything in the AI's mission structures.
I have no clue where you got the idea that this was about "giving your nation insight" into western civilization. Constantinople was, by far, the largest repository of Western Civilization (Roman, Greek, and Christian) when it fell. Rome itself had long slipped as having a great store of Western knowledge - Ravenna having been the major locus for the late Western Empire and even the Pope decamping at times. Certainly post Charles V's sack Rome had precious little of value left. I mean seriously, Danzig was only founded around 800 and was never a major seat of the Western tradition. It was neither the primary seat for the TO nor for Poland and only passed into true "Western" control in the late game.
The in game text states
specifically that this is about proving your right to be taken seriously as part of the West - i.e. the leading scientists, philosophers, churchmen, etc. take notice of your nation and correspond with it.