Fusion DSL with static IP should not have port 25 being blocked in either direction.
Correct; it doesn't. My SMTP server works fine. The discussion is that, if I move from Fusion DSL to gigabit fiber, not only will I lose static IP, I will also have port 25 blocked. The loss of static IP can sort-of kind-of be mitigated with dynamic DNS and a cooperative DNS host (such as Pair Domains). Port 25 blocking is rather more difficult to ignore.
The main thrust of my previous lament (okay, rant) was that I appreciate that there are likely business concerns that have prevented Sonic from making static IP and IPv6 available on fiber, but that these concerns have never been even obliquely articulated, and it's the lack of information on this point that's causing whiny grey-beards like me to perennially grouse in the fora.