It would save a lot of time in the day of an accessibility practitioner if automated tools could catch more accessibility errors. However, I think it’s a reasonable assumption that they should catch errors with incorrect nesting of HTML or ARIA. Unfortunately this is not the case, and Adrian Roselli has a nice breakdown with tests on his blog:
Developers who build a broken thing, but do not have the necessary testing or even standards experience might rely on automated tools and produce problematic content as a result.
Daniel Koskinen 