Why are the HP Prime and HP-35s so unpopular?

[ttw]

It's a matter of preference. In my case, the Prime had two big problems. First, it doesn't do RPL or RPN or the like; if I want to write out formulas, I'll just use Silverfrost Fortran which is much faster and easier to use. Second, when I tried to update the Prime using the USB, it shorted the motherboard on a desktop; thus I found it cheaper not to use the Prime.

It was neither user-friendly (with me as the user), nor hardware friendly to being updated.