Ahh, one of these "if it's new it must be better" people?
A reusable 4x CD-RW wins for me when it works better than faster CD-RWs and when it's reusable. Burning a CD-R for a one-shot need is wasteful.
My car doesn't have an aux-in jack (it's an '07, it's not that old) so I often burn podcasts to CD-RW to listen to on highway drives. Listen, enjoy, erase, use again.
I'm patient enough to have a 15-minute burn to listen to those podcasts. You're not, I guess. Spending the 15 minutes is easier than spending a couple of hundred bucks to get someone to figure out how to get an aux-in jack on my stereo... to me, at least.
I also play with a lot of classic computers and it's hard to find SCSI CD-ROM drives that will read fast-speed CD-RWs.
Really, by your definition CDs are completely obsolete so there's no need to fuss about what speed of CD media to use.