Wow, Najd isn't an Iqta anymore? IMO that hurts a lot more than a piddly 5 to 2% missionary strength nerf. If you're doing the achievement, you're going to take religious ideas anyway, and as Sunni it isn't that hard to convert stuff even without religious.
I'm inclined to agree, not having the 5% missionary strength sucks and is the epitome of PI baseless nerfs, but the change from iqta (best of the trash monarchies you start with) to freaking tribal government is miserable. The stuff from Yemen/Oman recently hit 0 LA in my 2nd screenshot:
People talk up tribal federation manpower and FL lately, but in reality you won't be affording that for a while...in part because you can't access ticking -LA or despotic monarchy unrest + theo + religion + stab --> lower auto manually.
BTW that 6 5 6 made me pay, he was weak claim 14 year regency trash mechanic

. At least I got a few wars started just before that began, unfortunately during westernization. Made things interesting. Also before I westernized Ming rivaled me (!).
I don't see why I'd go religious though. Even the Persian region I have is Sunni, though those were like 25 month jobs with 100% piety and inquisitor when you have 4 missionaries you're effectively blasting away at 2 provinces/year.
I have around 225 provinces BTW, so really far ahead of pace despite westernizing considering how the end game goes. My only idea group is administrative ^_^. I'm going to front +3 adm advisor and try to vault up after finishing the group for discount + neighbor bonus so I can get ADM efficiency.