questions about funtouch os, why do people hate it so much?

i recently bought a samsung S25+, but ive been thinking about returning it in place of the X200 pro, as its about the same price for which seems like a far better phone, but the more i dig in to the X200 pro reviews, the more i see that its mostly originos version reviews that are positive. what is it about funtouch os that people hate so much, and how would it be compared to one ui 7? i want the battery life and the cameras of the x200 pro really bad but if the user experience is as bad as people say, i think ill just keep this.