Software (like DbPower) can correct errors ... Error correction is sales fluff and not a real time issue if you have done it thousands of times like I have.
It isn't clear why you think error correction is "sales fluff." I found it a worthwhile feature when using EAC, where sometimes the software will read a specific disc sector multiple times to ensure bit-perfect accuracy. EAC can generate a log after each rip, identifying the troublesome sectors and the outcome of the attempted error correction. (It doesn't always work.)
Metadata is called up from the network in which it resides. Hence, it can change ... Those who carry their music around and play in cars, etc are subject to ever changing metadata info ...
The metadata for my files is stored in the files themselves - it never changes unless I go in and edit it. When streaming (such as Qobuz), the metadata is provided by the source.

