It’s really not though, or at least not the only problem. <input type="number"> has some additional behaviour that makes it inappropriate for phone or account n

It’s really not though, or at least not the only problem. <input type="number"> has some additional behaviour that makes it inappropriate for phone or account numbers or anything you wouldn’t store in a numeric data type: many browsers will strip leading zeroes; they may display stepper buttons; on-screen keyboards will offer a decimal point (and/or comma, depending on the locale); and something like 1.42e-60 is valid input as far as the browser is concerned.