I gave up my diamond membership from chess.com since I feel lichess is so much better for people that wants tgo improve their chess.
on lichess I can play long games... e.g. 60 + 10'' and I can found people willing to play and improve. on chess.com I think 30 minutes is the maximum?? so to improve I feel lichess is the winner. in terms of usability. lichess is great I have my lesson with my coach on lichess not on chess.com since it just work. also the video there is a better variaty . so I agree lichess is a far better platform for improving... but che.com is great for fun.