Agreed, it takes a while to do, but worth the effort. When my indoor CD player gave up the ghost, I invested in a streamer (Linn DS). Amazingly, the files (FLAC) sounded better on this than the CD player (The highly praised Linn Karik). I ripped all my CDs to a hard drive. All you basically do is pop the CD into a CD drive, sit back and wait until the drive spits out the disc. Job done! You will need some software to do the job. The dreaded iTunes (if it still is available) will do the job. If you use this, make sure that you do not leave setting to default as this will convert to mp3. I don't know if any form of FLAC file is available on this, but WAV is OK.
I only use Audible for mp3 so can't comment much. Again it is OK.
I would recommend dBpoweramp converter. A small charge initially, but it is very good for Tabs (you get a choice of providers). Classical Music is always difficult to get the correct info. Have to admit that I haven't used it for a while though. I stream all my music from Qobuz indoors and they allow you to download tracks to phone etc. I suspect that the music will disappear if the subscription stops. Pay the subscription annually and it is probably equivalent to 1 CD per month. I doubt that any car system will do justice to the HiRes files which can be accessed.
VERY IMPORTANT- when you have ripped all your CDs, keep a copy in a very safe place!
As far as I am aware, there is little difference between FLAC and WAV files sound wise. FLAC is more convenient (Less disc space and Tabs).