It's because of the spray these ground effect cars produce from the diffuser. Very hard to get around seeing as that aero function is the whole reason for this rules framework. FIA is just not going to green flag any race under conditions that demand Full Wets when the visibility is as poor as it is. Makes sense then to scrap that tire. I'm all aboard on this, it's perfectly logical given the circumstances.
I would - of course - prefer to have proper wet races again, but that won't happen until 2026 at the earliest, I would assume.