Many plugins peaks the CPU inside Studio One, just in Studio One, try meldaproductions, try soundtoys, as example!
And many needed things are missed like fades and event volume for audioparts!
Examples for bugs: If you have fades and event volume and you use melodyne and you render melodyne, all the fades and event volume is deleted! if you record a arpeggiator, the first notes are not played, you must quantisize everything that it work. It works because the last notes before the end of the events are shorten. The same issue if you use chords, which begin at loop start and end at loop end and before and after is the same chord. the chord is not audible! If you shorten the end of the chord, everything is working!
and if you have automation points at the borders between two events, Studio One dont know if it is the beginning or the end point of event. that causes with copying, moving and duplicating problems>>>buggy!

Many plugins crash Studio One after a while like Tone2 Electra. I reported all the stuff to the developers many many times and they change some things but many stuff is still as years ago. Studio One is annoying in some points. And many nice functions are missing like something like smart controls/macro controls, better automation visibility like fl studio or pro tools.