In the case of auto sound, it's often for horsepower (many speakers, huge amplifiers) than it is sound quality. Don't know why cars bring out that sort of a mentality. I once saw a video of a preposterously overpowered sound system playing in a car with the owner standing outside of the car, and...
Some problems simply don't have simple solutions. Either that, or simple solution may work but a bit more complex one may work better. Use as much complexity as needed and no more.
Slow changes remind me of my eyeglasses getting dirty as time goes by. I don't notice the incremental change over time, but when I wash the glasses, then the change (vision degradation) sticks out like a sore thumb.
Vinyl playback setups can have a lot of variability in S.Q. as well. If the device is electro-mechanical, you'll get variability. Electronics, once good enough, will sound very similar if not identical.
My impression is that a bad review can kill a product more quickly than the product itself will because with the review, every prospective buyer who sees the review will be tipped off and not waste the time and money on the product. If the product is poor but not reviewed, there will be a larger...
100 to 300 ohm Zo wouldn't be damaging if that output were driving a preamp or power amp input, which typically exceed 10K. Directly driving headphones would be a totally different story for sure.