Humidity and moisture kill electronics. Maybe not immediately, but over time.
I'm still dealing with corroding circuit traces in my old sennheisers, some 30 years later now. Literally inches of circuit board gone now, originally spurred by moisture.
You might think that you pulled some gem i the rain, but iis it worth hundreds of dollars?
I know that concerts slip past every night, and I still get a good nights sleep knowing that they didn;t get documented.
Night three of a five night run in one city isn't all that much to get worked up over, as they'll be some similar set list in the next towns three night stint, and so on.
What matters?
Premiere playings of original compositions that might not ever get played again.
For those, I might consider dragging my gear to a nice enclosed venue if it were raining outside. But I'd park at the back door, and run my gear inside, ardly letting a raindrop settle before I wiped it dry.
But then again, I live in socali, where it hardly ever rains, and when it does, we see concerts inside.