Visibility continues to be the biggest issue in FIA
https://www.bbc.com/sport/formula1/66351630
Drivers are complaining that the extreme wet tyres are pointless... because they're only best when conditions are so poor that visibility is unsuitable and cars aren't allowed on track. As soon as the visibility is good enough to drive... they're better off on inters.
I guess the 2019 FIA spec lights aren't much good if you've got full aero/ground effects. Good thing we don't have that problem... oh, wait.
I do think it's clear that the aero impact on spray creation is a driving force in the need to have better rain lighting... hence why FV and the like don't have the same kind of problem as Things with Wings.