What I hate the most on the overly increased coring and annexation costs is both Administrative and Influence are mandatory for SP. Previously you could live without it and pick different idea groups. .
That is simply not true.
You can conquer ALOT no problem before the game ends without taking either influence or administrative.
Here some math as proof (disclaimer this calculation disregards all events stab hits and other mp drains as well as no developing provs since not everybody has CS so of course its not accurate):
Total BT in europe 1444 2360
Total Production in 1444 2335
Total Manpower in 1444 1558
Total Dev in europe 1444 is thus 6253 comes to 62530 adm to core.(without any CC reductions form ideas adm efficency or even just claims)
You make 3 MP base if you have a 0/0/0 ruler (which is very unlikely) and no advisors.
Topped at 13MP (15 if you count National focus again not counted because of DLC) per month in ideal case of +3 advisors and 6/6/6 rulers(also very uncommon
So for a game that takes 377 years that makes 4524 months.
Worst case(impossible since you must like not play the game to at the very least get +1advisors)
4524*3=13572 adm -> 13572/62530 =0.21 so you can core 21% of europe. Not great you might think but still 1357 dev which is quite a bit.
Average case(lets say you have average rulers that have 3/3/3 and can afford lvl 2 advisors )
4524*8=36192 -> 36192/62530=0.578 so you can core 57.8% of europe. Now already 3619 dev which is more or less the dev of Rome at its greatest extend applied to eu4 map in 1444.(thats 3758 dev

)
for funsies:
Best Case(also practicaly impossible since 6/6/6 rulers are sady quite rare and you cant afford lvl3 advisors as most nations the entire game)
4524*13=58812 -> 58812/62530=0.94 So you can core 94% of europe. This amounts to 5812 dev which is incredibly much and i think not something you would ever achive unless you go WC.