Same here, I have zero interest in buying an Apple Silicon Mac. My M1 mini is basically nothing more than a plex server, because I work much better with Windows (and I couldn't care less that we are on a Mac centric forum).
And for laptops I want cellular, which Macs don't offer any way. Nor they offer any under 1kg Macbooks (except the Intel retina Macbook which I have).
And I want pen support, but I am no "digital artist", I just need to annotate Word and PDF document for my work, which I can do on iPad, Windows or Android but not Macs.
And I want a small phone, and even if one day I get a foldable, it won't replace my larger tablets, at best it will replace my iPad mini...
The OP is assuming people only want one device, while many who buy iPads pro already have Macs or PCs, and have different uses for them.
If I had to keep one device, I would keep one of my Surface devices, but I like having iPads too as they have advantages and even having iPads of differents sizes for different uses...