Minimal DMARC reports would be useful. The problem that I see for small businesses is the cost keeps them from even trying it, so they can have problems that never get surfaced.
As an example of where I think the current value propositions are bad, DMARCian charges $240/year for the most basic plan that includes 100k compliant messages in a month. Most small businesses won’t do half that in a year. You probably have good stats to grok that.
I get it on the support thing. I pretty much never use support, so I guess that’s why I always feel like everything is too expensive. I’m always stunned to see how many employees at smaller tech companies are support. Sometimes I feel like I’m subsidizing users that are too lazy to learn.