Andre Yew wrote:
2. There're DSP operations which require high sampling rates, such as
non-linear algorithms like compression, because non-linear algorithms
generate harmonics which may alias.

Fine, and the way that's done, and has been done for quite some
time in the professional world, is to oversample, process, filter
back to the original base bandwidth, then decimate. Poof! aliased
harmonics are gone because they were never there to begin with.