I think the central thesis of this thread is that the iPad, as it exists today, is very much a YMMV experience. It works well for some people (albeit even then with some compromises) but for a lot of people it's just become redundant.
When the iPad was introduced, Steve Jobs talked about how the iPad (and by extension any other device seeking to exist between smart phones and laptops) needed to be "far better at doing some key tasks, some really important things" than laptops or smart phones. At that time, and at various points in the iPads history I think you could reasonably argue it WAS better (or at least far easier/simpler to use) for many of the day to day tasks than either a laptop or a smart phone. Heck at one point Apple was touting it as the future of personal computing (suggesting tablets would replace laptops and even desktops.)
The problem is that's no longer really true today as the iPad never really managed to define exactly what it was that it could sustainably do better than smart phones or laptops, and thus never escaped that position as an "in-between" device. Therefore, as those devices have continued to improve, they've eaten away at the total addressable market for tablets. I think the best evidence for this is the almost complete death of Android (and other mobile OS vendor) tablets. If the market was viable, and truly offered something obvious over the alternatives everyone would be trying to get a piece of the pie, but aside from Apple, everyone else has given up.
For the iPad Pro in particular, many of the improvements the iPad software stack desperately needs have been pretty obvious for years, but Apple is clearly wary of the iPad Pro becoming a touchscreen Mac in all but name. At the same time, I also feel they're slowly killing the iPad with bad pricing on the most attractive models (Air, Mini) and base models that aren't compelling for anyone outside educational institutions buying at scale.
Anyway, just my two cents as someone who used to enjoy iPads but hasn't owned one in years...