Ratings only matter to those to whom they matter to. I have been playing chess off and on for 30+ years and have a blitz rating of 550 - 700 and I don't care. Used to have a rating of 1700 - 1800 and didn't care much then either. I am happy in life, so such shallow matters do not bother me, though I will say there is an inverse relation to the attractiveness of of ones significant other(s) vs. chess proficiency. That said, my rating still trends downwards and that is fine with me.
You think of ratings in very basic , simple ways.
It's actually very philosophical subject.
"Shallow ratings " you say that's how you see it and I do agree sone thing are way more important in life, BUT look at this rating a different way .
Rating shows who you are as a person are you willing to work hard? Are you motivated, are you willing to take risks and be successful? Are you happy with who you are at the moment?
All that not just about rating but about every day life , why go to gym and have a good shaped body (1000+ rating ) if I'm happy with my fat belly (300+rating ) , why have a better job (1000+rating) if happy cleaning toilets (300+ ratig) as long as I enjoy it .etc......
You see my point ? It's not about rating its about you and ratings just shows who you really are as a person same as other things in life.
It's not "a lie." It's a different opinion. Fun does not have to be quantified. If you're playing to accomplish a goal, then yes, ratings matter. If you're playing because it's a fun board game, then no, ratings don't matter. It all depends on your perspective.