1. Don't need razor blades anymore.
2. Don't need to clean the heads.
3. Don't have to worry about tape shreading.
4. Don't have to worry about noise level.
5. Can replace any drum sound or beat at will.
6. Don't need cassetes.
7. Don't need large consoles.
8. I don't think alot of mic techniques have change.
9. Songwriters may be much more involved in engineering (at least their own demos).
There's a quick stab for you.
Rimshot