Been an Apple user since 1989, owned at least one item of nearly every Apple product category that was ever released, even printers - if people can remember Apple printers...
Having said that, the top-end iPad Pro M1 that I purchased 3 years back is the worst piece of Apple kit price-performance-wise that I have ever owned.
While the CPU is powerful, the hardware has some unique and unexpected usability flaws due to over-engineering, yet the worst part is iPadOS. I really cannot get used to it. It plain out sucks.
My own realization is that I will never pay that much money for an iPad ever again. It is a complete waste. For the price you pay for a high-end iPad Pro, it's just too much for what you get.
Likely other people feel the same.
So I can totally understand why the iPad Pro is a failed product. Not as bad as Apple Vision Pro, but nearly as bad.
The original iPad got the price / performance ratio right.
But once Apple got greedy and they started laying out a range of iPad products, with deliberate limitations in lower end models, in order to upsell customers to higher end model - that's when the iPad product line collapsed IMHO.
It's not worth the money anymore.
If a low end iPad cannot do what you want to do, you are much better off with a MacBook Neo or Air instead of an iPad Pro.
As long as it runs iPadOS, I will never buy another iPad Pro again. That's for sure. Total waste of money.