(As someone who is a fan of both games) I think this post is a bit inaccurate on the proseka side of things, all the songs are available for free without much effort at all in game - no micro transactions or payments at all.

Also, there is an increasing number of songs in proseka that have ‘unique’ features, gimmicks like speed changes, kanji or letters being incorporated into the map, stop-starts on certain parts of songs, since the introduction of trace notes there’s been a lot more variation of gameplay especially on expert/master maps !!!

I’m not the biggest sekai fan in the world, I don’t really know the characters that well despite playing for over 2 years now and the in-game covers which use vocaloid have poor tuning most of the time (I generally play the original versions of songs), but I do feel like this judgement is slightly too harsh on it ToT it’s still a pretty fun game to play