well, my personal pet peeve remains an inability to create a not buggy macro to duplicate a track, mute and un-arm the original, record-arm and unmute the new one. 'not buggy': reliably working, like similar one in Cubase or Reaper. it works, but if the track in question is last, not really. if the track in question is last in folder -- it also makes a mess out of your mix, record-arming and muting many unrelated tracks with no undo. there's a certain race condition that just breaks it from working properly, PreSonus support acknowledged that it's 100% reproducible, but it never was to get fixed over the long years.
or you were talking about new S1 regressions? take a look at S1 forum, the 7.2.3 thread mentions a Melodyne regression (absent in 7.2.2) and no fix to v7 since October.