Android runs almost all USB keyboards and mice or touch pads

Yes but they don’t come with one attached like a laptop.

It is the same size as as the common smaller form factor tablets

Galaxy Fold has a 7.3" screen, which is barely larger than some of the non-folding displays. The iPad Mini has an 8.3". That’s about as small as they come and still significantly larger.

It is smaller than the average phone when folded into phone mode

Not in external dimensions it’s not.

They are indeed relatively more expensive right now

The tablet style ones are approximately double the price of a traditional phone. Or more depending on which ones you’d like to compare. I wouldn’t call that “relatively expensive”. That’s just expensive.

I got mine “open box” for half off, and it was about the price of a contemporary regular smart phone then.

And you could have gotten a “normal” phone for half of that, open box. Or 1/4 the price of a folding phone.

You are not always near your 75 inch TV.

And I don’t always consume media 🙂. Again, speaking for myself here.