I'd take the false positives, personally. If someone really needs to reach me and doesn't get to me on the first try, they usually just email or text back and go "Hey, did you get my email?". Or, just quickly skim through the spam folder once a week.
> Which has happened to me before where people wondered why I was ghosting them.
Same, but I feel like it's almost kinda socially acceptable now. Happens to everyone and it's not something to get upset about... "oh, it wasn't me, it just went to spam." Like Gmail managed to alter our public norms instead of ensuring a zero false-positive rate :)
Sometimes people will reach out again, but that doesn't cover all cases. If an old friend/acquaintance/relative who I don't regularly talk to reaches out and I miss the email they will probably assume I blew them off. Scenarios like they will be in the area and asking if I want to meet up, or maybe sharing something notable that happened to come up.
It sounds like a lot of people here check their spam folder regularly, which is good, but I don't know how widespread that is. I remember Gmail early on deemphasizing the spam folder since, in their view, the filtering was so good people didn't need to check it.