You make a valid point.
Let me ask you . Do you adapt to the tool or buy the tool that improves your efficiency?
To me, it's a combination of both. It's not everyday you find the perfect tool for your needs right out of the box and so to get what you need, so there invariably will be some compromise involved.
Case in point - I got my first iPad in 2012. After playing around with it for a while, I saw that it would offer some benefits over the windows tablet laptop my school issued me, but in order to use it effectively in the classroom, I would need to get used to the idiosyncrasies of iOS.
For me, what the iPad offered me then was an improved ability to work with PDFs (something my locked down laptop was ill-equipped to handle), an inbuilt camera for scanning and the mobility offered by AirPlay mirroring. It was also thinner and lighter than my work laptop, and felt less buggy to use.
And to master the iPad, I would have to learn to get files onto the iPad (which meant a long tedious process of converting my teaching material to PDF and uploading them to Dropbox), purchase new apps and resign myself to the fact that there were some tasks which are (were) just more inefficient on a tablet. Thankfully, I discovered a website known as "Macstories", and years of trial and error has followed thereafter, where I purchased one app after another, all to find that ever-elusive ideal workflow.
Over the years, Apple has steadily improved the capabilities of the iPad. The Apple TV gained peer to peer AirPlay (doing away with the need for a router), the iPad Pro added the Apple Pencil and split-screen, apps have improved in functionality while iOS gained better sharing features such as airdrop.
Meanwhile, extensive use of the iPad has made me far more comfortable interacting with iOS compared to macOS. Because all my files are on Dropbox, it has allowed me to work from anywhere (some colleagues even text me over the weekend for a document they forgot to copy from their school network). My workflow has more or less settled, and it has been a tiring (I have the battle scars and tons of horror stories to share) but fun journey.
So to me, the iPad is a tool like any other device. What you want to get out of it depends on how much effort you are willing to invest into making it work. For others, it's not worth it. For me, I can't imagine giving this up. Ever.