Sure, some photographers have to work in the rain, but wedding photographers? I doubt those need their cameras to be more than splash proof. I gather even some sport events take a break when it rains, e.g. baseball.
I think it really depends. Rain delay rules are different by the sport and some sports are more tolerant of rain than others. On the more tolerant end of the spectrum, I believe football and rugby only stop for lightning or dangerous weather. On the wedding side, I'd suspect more often than not splash protection would be sufficient. For context, I'm a hobby photographer but I take the odd paid job. The last time I shot a wedding was by far the wettest I've ever let my camera get. The client's wedding day rained non-stop but they dreamed of wedding photos under fall colour, so we made it work. Unfortunately making it work felt like I came out of a pool when we were done! I've shot in plenty of downpours for landscapes, but that wedding was by far the wettest I've ever let my camera get, and only because someone was paying me to do it.
Again, others have noted that a lot of the active cooling bodies can be weather sealed, and I'm all for that. Knowing my use history, I need weather sealing more than active cooling, but if I can have both, great! Again, I think it's all about picking the right tool for the job.