alt Hacker News> but is it an undue or unreasonable one in the current landscape
Yes. In the first place, this should not even be a thing. Two corporations should not be in control of who can send e-mail. If they want to mark not having DMARC as spam, mark it as spam, or better yet flag it with a specific warning about the domain, but these games with refusing to deliver are just bullshit and essentially force a monopoly where other e-mail providers cannot compete because their e-mails aren't delivered.
No, not delivering is much better. You get a clean error message that tells you exactly what to do, it can be fixed in minutes. Spamfoldering email for not having DMARC would be a mistake, it might be years before low volume senders notice and figure out what's wrong (if they ever do).