I can understand the desire to have a good tape deck to transfer tapes you cannot easily replace, but that doesn't really explain the need for "blank" tapes by itself. I moved my LPs to digital (yeah I play Dark Side of the Moon off the LP once in awhile directly, but honestly I can't tell the difference between it and the recording of it and the recording never generates a hiss/pops).
My first WRX was an '04. I eventually clogged up the 6-disc changer with a CD-R that had one of those glued labels on it peel up slightly and jam the mechanism. I put a JVC single CD + USB deck in and once I saw how well the USB stick worked, I never used a CD again. My next WRX (2011) had a USB in the glove compartment built-in. I think I used the in-dash CD player twice (when I bought a new CD and didn't want to wait to hear it). My 2015 Turbo Forester has the same setup (without the sub under the seat as the door panels have quite large woofers).
I still miss my '93 Probe GT setup, though. I had all Alpine speakers with a 12" 300 watt sub in the trunk with a Mini-Disc head unit and CD changer. Oh YEAH, fantastic sound for a car! The sub and changer took up half the trunk, though....