I use a Dvorak-based layout on Qwerty keyboards, so in normal usage they could as well have blank keycaps.

Despite that, the Qwerty keycaps remain useful for me, because my keyboards are not programmable, so the key mapping is done by the operating system. When I have to unlock the computer with a password, after booting, the keyboard still works as Qwerty and the keycaps help me in entering the password, because nowadays I touch-type only on Dvorak, while on Qwerty I must return to hunt-and-peck, as there are many years since I stopped using Qwerty.

So only because of this password entering, I prefer to not have blank keycaps, even if I ignore them in normal usage.