Blitz is the combination of flagging and skill, and not necessarily hard calculation. The speed makes it fun, but it’s not so fast that you can throw chess skill out the window to play well (cough ultrabullet cough)
Why do people seem to value blitz over rapid?

This is how I see it...
If we imagine our quality of play on a scale from 1 to 10, with 10 being the best, it's not hard to understand how improving our move from a 1 to a 2 might only require 5 extra seconds, but improving from a 9 to a 10 might require days. This means somewhere in the middle it's possible there's a jump akin to 10 minutes to 2 hours... in other words at certain point if someone told you "try to find a better move" you'd say "ok but a few minutes wont work, I need to add an hour to my clock."
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In fact one NM gave me a bit of advice before the first round of a G/30 tournament. He said to play it with the mindset of playing blitz, but slow down for the important parts... he said if I had the opposite approach, the mindset of G/60 or G/120 but tried to speed up at parts, I'd be shocked at how quickly the time disappears.
So yeah, in some sense Rapid is basically still blitz... it's sort of an awkward middleground... so most players prefer "real" blitz or "real" classical.
However I will say that I've played a lot of rapid games OTB, and they're a pretty comfortable training time control... I even like to recommend G/30 to beginners... but yeah, if I'm playing for fun, it's going to be 5 minutes or less, or over 2 hours

I think that it's a variation of instantaneous gratification. A large number of people like things to be fast, fun and exciting.

Well, remember, the question isn't asking short vs long games, it's asking blitz vs rapid.
Rapid is still speed chess compared to tournament chess, and the OP mentions that tournament players unexpectedly prefer blitz to rapid.

It's all relative. Back in the days when anyone could post notes on your profile, many of my previous rapid opponents complained that I was slow. I think that I average 30 to 60 seconds per move in rapid.

Me personally, i'm just not used/suited to blitz time control. Whenever I do play blitz, i get so stressed out by the clock that I can't calculate properly leading to blunders and frustrations. For me rapid is the right balance. But of course I am not a tilted player, I imagine that 5 minutes for a 2500+ or even 2200+ is not equivalent to 5 minutes for me. Time is relative as a famous german scientist once said...

It's all relative. Back in the days when anyone could post notes on your profile, many of my previous rapid opponents complained that I was slow. I think that I average 30 to 60 seconds per move in rapid.
You can still configure it to have everyone post on your notes, but the default is friends only now (?)

Sure it's all relative, but I think the question is like this, "I asked people to circle the time controls they like but I don't understand the results"
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Most people don't allow comments. They made the change because a large fraction of the comments were downright insulting. I allow anyone to post on mine. I haven't seen a single comment since the change.

It's all relative. Back in the days when anyone could post notes on your profile, many of my previous rapid opponents complained that I was slow. I think that I average 30 to 60 seconds per move in rapid.
You can still configure it to have everyone post on your notes, but the default is friends only now (?)
My account is pretty new and I haven't messed with the settings.
I just checked mine... yeah, it's set to friends only.
It used to be I'd get a lot of messages in my notes. Now I know why I haven't
I know that for most chess players classical chess with long time control is regarded as the most prestigious. But I found that most people seem to place blitz over rapid. Even top chess players sometime said that they don't like rapid (Dubov for example). I know that online, cheating is an issue, but OTB this reason doesn't hold.
Value and prestige are 2 different things.
Otb Blitz makes the game more physical and the energy is easily seen and/or felt by both spectators and players regardless of their skill levels. Might explain the value to the masses.
I know that for most chess players classical chess with long time control is regarded as the most prestigious. But I found that most people seem to place blitz over rapid. Even top chess players sometime said that they don't like rapid (Dubov for example). I know that online, cheating is an issue, but OTB this reason doesn't hold.