Almost all Stava KOMs and PBs will be wind and or done in a chain gang. I have PBs which I cant get anywhere near because I had a 20 mph tail wind pushing me and being towed by stronger riders. Pointless.
When I was in a road club I knew riders (myself included) who would go out when the wind was right just to try and bag a PB. Finally I saw the light. If you want to compete, which don't, then go racing with others who want to race on the same day in the same conditions.
These days I use Strava to record my rides and see where I've been since I live in a new area and don't always know anymore.
In my experience your first paragraph is both untrue and a sweeping generalisation which is unfair on the majority of users.
I like to compare my previous efforts on segments as a gauge to my improvement or otherwise. There are people in my club who are well respected for their abilities and it's nice to see how one compares to their effort. For example I recently PBd by 61 seconds on one of the UK's top 100 climbs - it's simply nice to know, a good feeling.
However I am generally unaware of where 99% of segments are located until I look at the Strava ride report. Most of the segments mean nothing and I wonder why they were created. If I spot something genuinely challenging I'll keep an eye on it.
As for weather related times? I don't know anyone who does this. From time to time folk will mutter "no PBs today" as we battle in to a blistering headwind.
Do I chase segments? Yes, a few. If I spot a hill climb and note I'm in the top ten for my age group I'll use the leader time as my target, my motivation. Not unlike seeing another rider in the distance and trying to catch him/her.
Is it fun? Yes. Do I care? No.