There are a gazillion MB’s out there that are mega fast, as far as recording goes. Stuff sufficient for at least 16 - 24 tracks. Why not just keep a few for DAW use and others for gaming or photo editing?
I have friends that run commercial studios and use older systems with no problems.
I remember stereo amplifiers boasting only 10% distortion. Then it went to 5% then to 3% then to 1% then to .05% then to .1% an so on down to .0005% and on and on. It takes a really good ear to hear 3.0%. So everyone was buying specs. Same with LCD TV's and many other products.
Perhaps gaming is a might different since massive video and audio have to emulate real time and intense graphics. But I do not see problems with older machines processing audio efficiently.
I have a friend that records 12 tracks with a PIII 450 and his stuff sounds good. However it takes about 3 minutes for the tracks to show the waves. Slower than molasses, but the recordings sound just fine.
In a lot of instances the industries depend on us purchasing specs when products we have work just fine.
Instant gratification simply takes too long.