It's not necessary in a strict theoretical sense to be Turing complete, yes. But in practice? Most of the magic of modern computing is in programs which can t

It's not necessary in a strict theoretical sense to be Turing complete, yes. But in practice? Most of the magic of modern computing is in programs which can themselves manipulate, translate, and even write new programs. Nearly all we've built up depends on that. You can only get so far in practice by flipping switches to encode binary numbers.