I think the difference as I see it is that Twitter/X is oriented around increasing levels of "engagement" and encouraging contributors to focus on going viral in hopes of going more viral by reaching the "For You" feed.

Bluesky seems a bit more like a 140 Characters mashed with Reddit with subtopics/submods of feeds as the focus as well highlighting the custom feeds feature which you can manage yourself. Twitter/X has these features but for the most part you are nudged away from these to improve "engagement" metrics.

Bluesky would be way worse than that in terms of engagement once their VC money runs out. Since it would be in their interest to promote more rage baits and echo chamber posts.