(Hi, new here, semi-exiled from HA)
To put a spin on it, it's a matter of whether you use your gear to listen to music, or use music to listen to your gear.
I'm firmly in the first camp. I can listen to good music on most systems, whether they're earphones and my phone playing 96kbps Opus files, a Bluetooth speaker, good headphones on a good amp/DAC playing lossless files, ok-ish headphones on my work laptop, or for that matter a YouTube video or an LP on my turntable, on the AV setup in my living room.
Sure, if a system has some glaring faults, like a complete canyon in the frequency response between 80-200Hz or something, that needs to be remedied, but otherwise if the music sounds decent, I'm fine.
I'm in the camp of science and measurements, but I think the strictness needs to be tempered by a realistic approach, in regards to real-world rooms and budgets. My own main setup (stereo speakers, dual subs, AVR, TV, HTPC, chromecast, turntable etc.) was less than $750 in total, all second hand. It sounds great and is fun for music and movies. Is it perfect? Hell no! I've even kept the original cartridge on my late-70s JVC turntable and only put a new stylus on it. I don't care that a newer cartridge might be objectively better, that's not why I like it.
But I enjoy my entire setup very much, and I've gone to some effort in the setup to get the most of it in my living room.
According to some hardcore objectivists, my setup is trash ("an AVR?! How horrible!"), and I'm sure most subjectivists would recoil in horror ("DSP processing! The horror!"). It's fine for me, though.
"Good enough" is good enough