queries for just a few domains fail (NXDOMAIN) for a bind 9.18 non-forwarding config ; forwarding does fix it. problem with 'my' config, or 'their' DNS ?

[PGNet Dev]

> QNAME minimisation is a good idea.  It comes in two flavours, relaxed
> and strict.  Relaxed tries to cope with some breakages like NXDOMAIN
> being returned from ENTs.  Strict doesn’t.

switch to 'relaxed' does, in fact, 'solve' the issue. insofar as, it appears, i no longer require the forward-zome workarounds.

that said, do i understand correctly that the Amazon et al responses are, in fact, 'breakages'?
and, if so, that i have probly zero-chance of getting them to fix themselves in the next century or so?
i.e., is 'relaxed' recommended for the real-world?