Like a lot of other ppl it seems I left off when they switched to composer. That didn't fit too well into the workflow I had at the time using cheap web hosting services where I didn't get a shell as dev environments.
Also the upgrade treadmill was brutal. A few nice little web apps I made got totally left behind by security updates and such and were also too hard to upgrade to newer versions of Drupal. I remember that also being a major motivator to make the big jump to Python and other things. More code but also easier to manage over long periods of time.
Lots of good lessons in Drupal for other frameworks. I haven't tried it in a while, but it's still in my mind one of the best low-code custom fields, forms, and views systems out there.