I think the ancient era placement changes from a couple versions back relates to what OP is talking about. It may be my lack of experience on newer versions, but since Trapping/Pottery were switched, and Construction/Military Theory, my research decisions in the ancient/classical eras are much less confident. Trade and Calendar might have also been swapped; I may be misremembering. Maybe Mining was moved too? The Ancient Era Tech tree as it is now leads me to want all of the techs ASAP due to how spread out all of the bonuses are, instead of finding a satisfying way to path towards Classical. I think catapults used to be at Mathematics, so I would b-line Math which would hit everything juicy except Trapping/Trade/Mining/Bronze Working on the old Ancient Era tree. Could switch to rushing Writing too if you picked the top techs first.
The way the ancient era tree is now, everything is spread out so instead of routing an optimal path/timing up the tree, I feel like I just gotta grab everything. Maybe I'm just bad or have a hard time identifying what I should prioritize based on neighbors/terrain. Even if the newer Ancient Era is easier for AIs to manage, that old tree sure was fun.