I don't think Ipads are selling well. I have an old style basic one (from 2019 I think?), and the only thing I use it for is to read articles and occasionally look at emails, for which it's perfectly adequate.

Tablets can do very little that you can't do on a phone.

Phones got larger and more capable, tablets now seem somewhat redundant. But a laptop with a keyboard and 'real OS' can still do many things that aren't practical on a tablet or phone.