Disagree. My iPad fills two niches: I read on it, a lot, both eBooks and general web browsing. I could do these things on my significantly smaller iPhone but that hurts both my eyes and wrists after a while. The other niche, streaming video, on the road and at home when away from the TV (e.g., in bed, out on the porch, etc.) Streaming video isn't as fun on an iPad as it is on a large 4K television but I can't take the 4K TV with me on a flight or intercity rail ride, and while the iPhone could do this, the iPad is the perfect balance between screen size and portability.
Another minor niche, video calls with friends. I tend to prefer an actual laptop for this use case but if it's unavailable or I'm too lazy to go get it, the iPad is better than the phone.
I'll confess I don't understand the folks using iPads as a laptop replacement. I get illustrators who use them, I have a contingent of those at work I support, but the road warriors I see in airports using iPad Pros as a laptop replacement, uhh, why?! It's just as large as a real laptop -- hell, some of the extreme iPads are LARGER -- and a lot less flexible.