Except I think I've had 1:1 personal e-mails from my domain go into a legitimate recipient's spam filter just because I didn't have DMARC set up and their mail server was flagging that "DMARC not set up == spammy domain"
Too many admins just had it set to “no valid DMARC? Spam” instead of the more proper “failed DMARC? spam”.
Which is subtly different.
That is perfectly reasonable. Set it up correctly.