So I do climb some mountains. I’m not really into the hard core stuff on the par of K2 or even Mt McKinley. I’d rather be in the neighborhood of those giants, but I also like to stand on a hard earned peak.
However, there seem to be some amount of research  indicating that climbing high altitude peak, especially very fast, causes permanent brain damage similar to what elderly get. Now, this is just preliminary research and more in-depth studies are needed. But it indicates that rushing things like many of the weekend warriors do may not be a very good idea. Besides exhaustion, really not much enjoyment of the nature, it may also mess up your brain.
Take it slow, enjoy the process. That’s what this all outdoors stuff should be about.