Fair enough. Out of my 15 Pro, m1 macbook pro and iPad with logi combo touch, the ipad is the last device that I would give up for an non apple product. I consider it my main machine.
People have different needs and preferences. For me, my M2 MBA + iPhone are my core/essential devices. If I had to get rid of everything else, I would be fine with just these two. I suspect most (
not all) people would be ok with just these two devices.
In addition, I have an Apple Watch SE and an iPad 10. The watch is good for tracking physical activity, but it isn't essential. The iPad is good for sofa computing, reading, and vacation, but again, not essential
There are situations when the iPad boosts productivity. For me, it would be secondary screen, hand off, markups, and notes. Of course, I can get a cheap 24in 1080p monitor for like $100 to use with my laptop. I can do document markups on my MBA. I can take notes with pad and paper.