The iPad has failed as a general purpose computing device, sure. But it has succeeded (along with other tablet devices of similar form factor) as a basis for a large and growing number of single-purpose use cases in various industries: - iPad POS are popular in smaller coffee shops and similar outlets - iPad-based document viewing solutions are used by pilots to replace large bags with manuals for planes that they us…
The issue with each of these examples is that hardware advancements barely matter. $200 Android tablet with a simple enough design works just as well. Apple doesn't want to participate in such markets. That's why they try to push creativity narrative, "what's a computer" and so on. iPad can only succeed as a premium enough product, and that requires software differentiation.
I mean, the normal (and I assume best selling) iPad is about 300, and will likely be supported for a lot longer than the Android one (my Air 2 is getting on for 6 years old).