Honestly, I do not really understand why to discuss the issue of number of provinces here that are appropiate for DH. Sorry, but it is at least to my mind absolutely closed issue.
- In DH there's no battle AI to help in ANY way with divisions micromanagement, all orders you have to give manually
- In DH unlike than in hoi3 and hoi4, there are more than 3 useful orders for units. There are literally whole tabs only for giving orders, for land, air, and naval units, each tab with different orders, which also allows to time set these orders up to one hour.
And now multiply number of provinces let's say 2 or 3 times like some of you want it.
Now imagine that you're playing French/Brits/any other country with large number of divisions which also has colonies or far theatre to conduct war, like both simoultanesly Europe and Africa or Pacific, and East Indies etc. let's say.
Godspeed with trying to micromanage all of this, trying to avoid encirclements, beeing outflanked, keeping coherent frontline and also keep some NORMAL game speed, like not to waste 5 min for one ingame day.
And where is management of economy, diplomacy, research etc.?
The truth is, that maybe map could looks better. Maybe some provinces could be better shaped. Maybe DH with more provinces looks "more modern". But the truth is also that, obiectively, multiplication of the number of provinces would shift the balance of ingame micromanagement unproportionally towards moving units, basically for no reason and therefore it would kill any other gameplay as well as the game speed (in terms of time required for micromanagement).
I'm sorry to say this, but if you're this kind of guy who loves to move independently every single regiment or brigade on map, then DH is just not game for you. You'd
probably like HoI3 with stunning number of provinces and ability to literally command every single regiment, but not DH. DH gameplay much more relies on managing whole country than only moving divisions on tactical lvl. DH is probably one of the last trully "Grand Strategy Games" where you have absolute control on almost every aspect of your country (ofc only to some dagree), and let it be this way. Please, do not try to make DH some HoI4 clone which relies heavly only on moving divisons, where other aspects of gameplay are neglected, because it will just kill this game.