having a big stack of separate components is just a preference thing.
The big popular thing these days in hifi is all in one do-all magic boxes that combine everything. like the Naim Uniti Atom or a Cambrige Evo.
But the usual stack of separates you will see might consist of:
Streamer
CD player
phono pre
turntable
DAC
preamp
power amp
We’re nerds, not decorators.
Some of us try, but everyones tastes on interior design is different. Personally I love super stark hyperminimal interior design as much as I also love busy maximalism, but I’m also extremely messy, cheap, single, and have lots of crap I need to sell so my room looks appalling.
the CD player is more or less a “solved problem” these days, so as long as it has a digital output and is actually outputting 44.1khz (or an integer multiple) not 48 or anything weird it should be bit perfect and a decent DAC will give you the same output as a high end CD player. The only differences between physical players tend to be minor things like physical noise (that’s a big one! cheap players are loud), speed of seek/start, degraded/scratched/burned disk readability etc.
Personally I use an older budget DVD player as a CD player, it has a coaxial output and connects to my receiver digitally. it’s only downside is it is physically loud, as opposed to the last CD player I had that was completely silent, but it was an overbuilt, heavy Krell unit.
you’ll be fine.
I’ve been using the same google mini speaker for sleeping music every night for (how old is the mini…) 7 years now and it’s just fine.
As for the amp surviving, with a little bit of luck it will last as long as you need it to, I just retired an old Yamaha AVR that was left on 24/7 for 18 years and it still works fine, even the display still works after all those years.