which user's perspective? i mean, are you speaking for yourself, or are you endeavoring to speak for everyone?Ideologically, yes it is progress, but from the user perspective is a regression as an app that worked in say 10.14 won't work in 10.15. Maintaining 32bit compatibility is costly as it needs at least some work.
Yes I use Darktable on Ubuntu instead of Lightroom that is a progress
it is up to the app developer to keep up with new OSes, not apple's job to hold back their tech to accomodate older apps. hence, the developer betas, etc.