I have a very active fantasy engine and use it a lot to help me generate orgasms at the age of 67 with bad ED. At various times I'll usually incorporate all of my 4-5 major kinks and fetishes, sometimes all at once, and whatever fantasy is almost always stimulating enough to arouse me to have an orgasm. And yes, of course any fantasy can be made perfect either in execution or in my response to a particular fetish, or to incorporate or experience a fetish that's just impractical to do in reality (e.g., being "forced" to have sex wearing wetsuits and sneakers while taking an enema from my Domme GF while in an underwater habitat). And I certainly enjoy any fantasy I generate.
But I've been lucky enough to have not all but a number of my common fantasies in real life with some of my Domme ex-GFs. For example, she dressed me in very snugly tied clean sneakers plus head to toe latex, a gag and rubber gas mask, cuffed me to myself or the bed, and gave me two separate enemas totaling 3-4 quarts. Then after edging me and making me sweat for 1/2-1 hour, I had to do various submissive tasks while dressed in the fetish clothes holding the enema (like getting up and walking around to show off my enema belly, getting her coffee, mild exercises, and finally kissing and fingering her to orgasms followed by vigorous PIV sex). Eventually I'd be allowed my own orgasms. We did that type of scenario a number of times, and I'd love to do it again because it was so satisfying and delightful. In other words, the real version was very, very good even though I could have somehow made the fantasy even more perfect.
I think what does it for me IRL is the actual physical sensations of the sneakers, the rubber suit and clothes, the gag and gas mask, the restraints, the enemas, etc., as well as the real domination I had from her which were all very real so I could feel them not just imagine them in a fantasy. For example the real smell of the rubber, tightness of the sneakers and rubber suit and hood, insertion and inflation pressure, fullness, distention, and finally both her and my orgasms all physically felt on or in my body.
Fantasies can be even more perfect in execution or scope, but to me, real physical and psychological sensations are better and more memorable in real life than any fantasy.