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Have to split this one up into it's parts, because you're describing two different things:
First one is there's no question that there's a distinct sound that comes from music made using early soundcards and midi-type composition; it's become known as Chiptune. The genre covers the original game soundtracks that form its roots, and also the later works that work within the same restrictions as a Self-Imposed Challenge, or imitate/incorporate the sounds, techniques, and/or hardware as a Retraux aesthetic choice.
Fan Dumb would apply to the extreme purists mentioned on the page, who consider only midi playback on vintage hardware to be Real Chiptune.
See also Synth-Pop, which is an closely related Electronic Music genre from the 80s that's had a major revival in the form of Synthwave - think the same concept, but with old-school synthesizers instead of NES sound chips.
Edited by Scorpion451See, but I'm not asking about the situation where someone is going for Chiptune or music genres that try to imitate the "80s were so cool and had so cool synthesisers" aesthetics ( and 80s were nowhere as cool as nostalgia people are making them up).
My point is when you have a music composer, who has to reduce his work to the technical limitations, despite having notes for an actual music that he wanted to make. He produces a MIDI, because that's the best the technology allows... and people absolutely refuse to accept that this is not "this is how it was supposed to sound", but "this is the best that was available at the time", throwing a fit when proper orchiestration is eventually made. Kind of a Death of the Author scenario, but that's still not that.
And I just realise something. Would The Coconut Effect qualify?
Edited by BetoniarzIf I understand correctly: A musician wants to make music with a full band or even an orchestra, but all they can afford is an electronic keyboard, so they settle for recording their songs as synth-pop. Some time later, they have enough money that they can now record in the style they wanted all along, so they put out a New Sound Album, or even re-record their synth pop stuff with the new full-band sound. But for whatever reason, the fans say they like the old sound better.
So the exact trope for the fan reaction depends on subtle nuances in why they preferred the old sound:
- They Changed It, Now It Sucks!: "Synth-pop good. New sound bad!"
- Nostalgia Filter: "Yeah, I understand the new version has better sound quality and more complex arrangements, and better reflects the artist's original intent. But still, I grew up listening to the synth-pop version, so I can't help but like that one more."
- So Bad, It Was Better: "The old synth-pop version was So Bad, It's Good. This new version is better, but now it's just So Okay, It's Average. The old, bad version was way more entertaining."

I'm not sure this is going to have a trope, but let's try:
During the 80s, we've got the explosion of synthesisers and MIDI format. For various reasons, music that got present in late 80s/early 90s video games heavily utilised MIDI, because there was literally all they could use with given file sizes and memory capacity, rather than the intention being to make it like that. The notes for each piece can be easily put on any given instrument, or even orchiestrated. Years later, audience consider the original MIDI formatting to be some sort of staple or desired intention of how the music was "supposed" to sound, rather than the technical limitation.
Any trope to cover this? Yes, I know Fan Dumb exists, but that's not what I'm asking, plus that's a flame bait trope.