Whilst I understand erring on the side of safety, it’s hardly monsoon conditions out there, a safety car start is totally unnecessary IMO.
I always wonder why they don’t send the safety car round with the cars for 3 laps to clear some water and get a guide on conditions then do a standing start after that, rather than stealing the most dramatic part of the race (sometimes) from the fans attending and watching around the world.
I've been at Spa when it snowed, on 1st June! the places is brilliantly bonkers.
Its treacherous in the rain and the rain is heavy . . . You get a lot of standing water in places, its really really hard work to drive and stay on track/alive whilst attempting to race . . . . Add to that the fact F1 cars aren't designed for this kind of weather.
We did similar in 2012, on crossplies its like ice. Rain was persistant and consitant for the day . . https://youtu.be/1MJ6-DPcjOk