If it is too wet for extremes, it is too wet to race.. There should be adults in F1 race control, and sadly, F1 does not employ adults.. Adults that can be reasonable with logic, and think, "is this safe?" If not then don't race...
The only reason for "rain-guards" is for the spray, at that point the tyres are themselves more like the hull of a small rubber duck, they are no longer tyres... The idea of rain guards is pointless, a lot of F1 now is pointless, and to prove this, they want points to 20th...
I have watched enough wet races, and there was only 1 wet race that matters, Canada 2011.. Insane cannot begin to describe that event, It was wet enough that at some point an adult was employed in time, to red flag, but brave enough to send the fleet of rubber ducks out, and we had a brilliant end of race..It was safe...
Where we had the lack of adult supervision, Japan, more than once, 1 year, Martin Brundle nearly severed the legs off a marshall, and sadly we lost a driver... Jules Bianchi..Which brought about a raft of innovations which sadly the children running F1 forget, that is the thing with employing toddlers, they have not had time to learn...
The concept of rain guards is built on a bad idea.. If it is wet enough for rain guards, you really should be racing paper boats...Not meat in carbon tubs..