You know, I keep thinking about this, and I just keep coming back to: people are different.
My DH is spendy as hell. He also gets more from his job than he could get from retirement: he got a Ph.D in EE because he's a total geek and loves that stuff, and now he has a job developing advanced tech. He is a pig in slop. Even when he gets really, really frustrated, and I remind him he can quit any time, he is not ready to give up the tech. And it's not something he could ever replicate at home, unless we had a spare billion or two lying around -- once he steps away, he is done. So from his perspective: he is working on stuff he enjoys; we have enough saved to be totally fine if the shit hits the fan; he makes plenty of money and has no desire to quit. So why not use some of those extra funds to live it up in the meantime?
As for me, I'm here because I am far more naturally frugal than DH but have gotten lazy and let DH get too spendy on stuff that doesn't matter (e.g., Panera or pizza because "I don't *feel* like cooking). And I like the reinforcement I get here that frugal is good, that saving comes first, that you don't need fancy stuff to be happy. BUT: 20+ years with DH has taught me that I also like certain nice things and am willing to pay for them. E.g., when we moved back to my old neighborhood, I took great pleasure and joy in buying a house that, when I was growing up poor, I saw as one of the "big" houses,* and fixing it up. It has been 13 years, and I love my street, I love my house, every time I spot it while driving home it makes me smile. It is a constant reminder of how far I have come from the food stamps; knowing that I can afford this and am safe and secure here and won't ever have to move again if I don't want to gives me a degree of psychological contentment that I have never had. It's sort of like a 3D gratitude journal, if that makes sense.
[*"Big" as seen through a kid's eyes; it's not actually huge or fancy, just 100+-yr-old American Foursquare with sort of classic lines and old-house character -- and 1/3 cheaper than the new homes in the next town over]
I also have a totally unnecessary convertible that DH talked me into; it was supposed to be "his" car, and now I drive it about 364 days a year -- we're talking top down whenever it is above 40 and not actively raining. I love the feel of driving, I love a stick, and feeling the sun and the wind is such an added boost. It makes me happy literally every time I drive it.
One of the recurring themes I read here frequently is that spending on more than you "need" = bad -- it's all driven by a mad lust for power, or ego, or a desire to impress other people. Clearly, some people behave that way and are driven by those things. But as for me, well, honestly, I couldn't give a shit about what people think -- I'm an introvert, people outside my immediate circle are sort of only marginally relevant to my life anyway. :-) If anything, the pressure is the other way around: I bought my stupid car *knowing* my mom would disapprove -- and her opinion I do value. I would much rather fly under the radar, and it annoys me that I own some things that attract attention. [I am looking at a different possible stupid car, and I like the fact that the badging is black, because it doesn't shout "I am awesome and can kick your ass" -- it just sits there quietly, and *then* kicks ass. :-)]
So I guess the tl;dr is that DH and I spend money on certain things because we like them and they make us happy. We could FIRE, but without either a horrible work situation or a compelling desire to do something different, why bother? And if any of that changes, we'll adjust as needed.