I haven't messed around with car audio in more than two decades. I'm sure things have changed a bit. I think that decades of loud noises have degraded my hearing enough that truly great sound systems are probably not worth it. I have also succumbed to the convenience of IHeart for my commuting tunes. The Monsoon system is old, but still sounds acceptable. Glad to hear the car audio game is alive and well though.I have always installed really good stereos in my cars. Yeah, cars are noisy, but cruisin' with tunes is a big deal to me. I had a jl audio xd700/5 which got overheated sitting in a parking lot with the windows closed when I was on vacation. After two years of using my money for other, useful things, like paying off my townhouse, late Fall I sprung for an HD900/5. The is the most musical, best sounding amp I've ever heard. It is just wonderful. And I can hear lyrics in songs I never could hear before, even when travelling 75 on the highway. Combined with all of the soundproofing I've done, it's a nice result. (I forget what speakers I'm running, sorry.)
I do run a tube amp setup at home, but it's lower-end stuff. I have heard truly high-end systems, and have gone to stereo shows, but that's a dream for another day.
Most modern music is horribly overproduced and overmixed, probably to sound better through crappy earphones.