I totally agree. I just tried the Suzuka 800pp GT race. 3 laps in it starts getting dark, I don't have rain tires so I quit. Buy the tires and restart, pit at lap 4 and it doesn't rain for the next 2 laps. Tires are shot and I've lost tons of time so I quit again. Back in with RH tires, this time make it to lap 6 and it's dark as hell so I put on my Rains. Again it doesn't rain and I have to quit.
I know the trick with zooming out the weather radar but it's not very consistent. Frustrating that I spent 40 minutes on a race that I never finished because the UI sucks. Yeah I could do it a 4th time and stick with the RH tires until there is heavy rain, but I wasted too much time already so I just want a cheat sheet.