As you know Raymond I've been playing keyboards/guitar in bands since 1970 and I've never needed a keyboard bigger than 61 keys or weighted but that's modern music for you.
So many years ago when I built my desk I knew I'd never need anything bigger and this accommodates my 3 Roland keyboards (at different times).
OP it all depends what you want out of learning piano, do you want to learn some tunes or do you want to go through Grades and play like Mozart?
At one time I thought I wanted the latter but I ended up earning money by doing it a lot simpler.
I've got to admit I'd love to get on a proper piano and knock out Rondo A La Turk but then I think "Why?".