Let's just call it higher quality. The word audiophile gets a lot of wild definitions, look the one in the dictionary up and it pretty much says someone enthusiastic about high fidelity audio reproduction. You just being here qualifies you as an audiophile.
CDs are generally the best quality for home consumption, and replaced vinyl in that regard (I'm not going to get into the whole vinyl is better thing...let's just say the potential of cd as a medium exceeds vinyl quite a bit, but that potential isn't always achieved...and I say that as someone who still has his rather large vinyl collection and a turntable to play it on). There are now some ways to exceed that but not always readily available or economical (his res recordings via download or blu ray disc etc) let alone readily apparent audibly. I stream Pandora free (128 I believe on the apps I have) and Spotify premium (320kpbs) and with Pandora it can be evident at louder volumes, they both work rather well. If you want lossless cd quality streaming there are a few services, Tidal probably the most famous. FLAC is a way to compress a lossless file...it doesn't necessarily indicate what was encoded, it can be 320kbps, it can be cd quality (16bit/44.1khz/1411 kbps) or it can be hi-res (higher bit/khz numbers).
I wouldn't worry about your setup as long as you enjoy it, although better speakers are often the best route to better audio....and your room. The convenience of HEOS and Sonos are attractive, have heard casually a small Sonos speaker and I wouldn't expect full range performance from it, altho it sounded fine, it was a single portable speaker on the patio while we ate lunch at a friends house. I still hardwire my amps to my speakers (but enjoy wireless streaming of my own stuff or other services over my wifi network thru a variety of devices).
You do some recording?