map painting was due to limitations similar to the countless slitherine studios 4x games with basic everything.
world conquest was easy because the games had a fundamental issue where it make the internal front easy so you keep just expanding none stop in a snow ball ,
ck2 make doing that very hard at risk of implosion and fragmentation , the bigger you are the more vassals you will need the more their coalitions will be stronger than you. so there was balance but in Eu there was no balance , nations dont fragment but they keep exponentially getting stronger. most peoples dont want that.
i still mourn the early civil system of pre utopia stellaris where a major empire would get imploded to countless mini states and how worlds would rebel easily and so on .
internal front is important , its what keep us busy in times of peace , its what makes us to play tall and enjoy the run instead of just 2d conquering and expecting no consequences . so here before you go for world conquest you must know what your population is made of , who's gonna have privileges , can you make enough food , enough money and weapons and for how long can you keep your conquests stable and happy . this is the fun , the micro of actually managing a nation and not just playing RISK.
you are later anyway , your demand will not change this core aspect of this game so you either adapt or stick to older games .