What do you mean by "reading experience?" Like, that feels very subjective! It's hard to ponder "which is more important, plot or reading experience" when I can't be sure we all mean the same thing when we say "reading experience!"
What makes a reading experience bad? Like, you talk about liking pretty and fanciful language, but pretty and fanciful language can fall into purple prose and "her sapphire orbs gazed downward" if you overdo it. So if reading experience refers to that sort of thing, it's easy to see how it can be bad sometimes. Or does overwrought prose also fall into "bad reading experience?"
And someone can value "a good experience" and be coming at it from the exact opposite angle you are -- the idea that a fancy, poetic, complex story is nice and all, but sometimes you just want to sit down and read something tropey and simple and fun. The fanfic staple of "And there was only one bed!" is by no means a deep and intriguing plot, but it might be a good time regardless! So you could argue that a simple, tropey story is one that values "reading experience" over plot.
To answer the actual question, I think a story can have a solid concept, but if that concept is conveyed poorly then it doesn't matter how interesting it is. Like, you can see this happen in real life --- most people know someone who could have the most interesting thing happen to him and yet when he tells the story at parties it's somehow boring and tedious or hard to follow. And then there's the one other friend who could have the most mundane story about That One Time She Was Cracking Eggs And One Of Them Broke and yet the way she tells it draws a crowd every time.
But I don't think that's about fanciful or poetic words -- telling a story well is about things like clarity and foreshadowing and pacing and set-up and tension and resolution. Whether you choose to use simple language or poetic language isn't a matter of valuing plot over prettiness -- that's just a stylistic preference.
Ultimately, if you get me a gift, the content is most important. If you wrap it in simple brown paper it looks nice! If you wrap it all fancy with a hand-tied bow that's also nice!! If you wrap it kind of incompetently or wrap it in newspaper that looks less nice, but it does the job and the content might still be good. But if the paper it's wrapped in is soaked in blood or smells strongly of fish or was previously used to housetrain your dog, that will absolutely make it hard for me to appreciate the gift inside. The fact that the wrapping is capable of ruining the gift doesn't mean the wrapping is the most important part.
