I echo your concerns having migrated back to Premiere in 2012 only to find great features hampered by poor performance and incomprehensible bugs. It's been so long since I've had a clear editing experience with no glitches. I'm writing this with (Not Responding) yet again within Premiere. It's frozen entirely, all morning, after three reboots and not a single piece of meaningful work accomplished.
I moved to 2019 because 2018 was giving me heartache. I moved from 2017 because it proved unreliable after a few months. How does software performance degrade and why should I have to know the ins and outs of my operating system just to nudge this app along?
I'm completing a feature and have only four days of post left on it, but it's taken just under a week (Christmas breaks aside) to make minor adjustments to a credit roll. Everyone says, stay with the stable version and don't migrate your project to the upgrade. But I have yet to have a satisfactory experience with any version. An upgrade means upgrade - it ought to be an improvement. I shouldn't have to reinstall an operating system which is what I'm looking at along with rolling back to 2018. Yes, I've had to do this before, and I've upgraded a motherboard and memory to enjoy a small time with a relatively stable Premiere until the next pitfall and that's what it feels like, unstable.
It rarely feels good to be working with it which is such a disappointment because I love my job and part of my job entails teaching this occasionally amazing freakshow.
Andrew