's 'orses fer courses, innit?
I have a desktop computer. I can't be bothered with these fiddling laptop things, no matter how powerful. The desktop gets used for development work and admin and the like. I regard it as essential, and one day I'll buy another.
I have a fiddling laptop thing. I take it on holiday with me, and I use it on the train, where it gets pressed into service as an ersatz desktop. My heart sinks at the thought that one day I might have to buy another - I can think of things that I'd rather spend money on.
I have an iPad Pro. As a means of vegging out and consuming - video, and in particular newspapers, magazines and comics, it is peerless. But when I add a keyboard (Brydge in my case) and mouse (Logitech) it's very nearly the equal of my laptop - but it's lighter and easier on the battery. I use it for all kinds of work then. And I may not need to buy another laptop - I'll just get another iPad - and I have no objection to doing that.
I have a Kindle. As a means of reading pulp fiction it's great. You know the thing - thrillers, adventures, crap prose but an exciting story. For the books I want to savour and enjoy again and again, works of art, I'm an avid supporter of tree murder.
For my use case, I don't need iPadOS and macOS to be any more integrated than they are already. For that matter, with iCloud installed on my PC, I don't need Windows and iPadOS to be any more integrated than they are already. I like my iPad a lot. The laptop I'm meh about.
Your use-case is probably different to mine - so isn't it great that we have a choice?