>Always? If emails are not answered you'll usually notice unless you're a Spammer

Means you're not using your email seriously. For example, to send CVs in response to job postings.

I send up to 20 email per day to people who have issues with their package build scripts, and I have no idea whether they ignore me because they stopped using the distro or because mail got dropped.

MS live/hotmail/outlook would silently drop - although not for this DMARC, that gets a straight bounce.