People are too extreme nowadays. They see something like this and freak out, that's the problem. If I sold a bunch of saws and a new air filter came out - I don't want my doors kicked in by adrenaline high people demanding new filters at no cost or else they'll disappear forever. Because that's how people see these things. They are not recalls, but service bulletins. The units that MAY be affected (not definitely, probably, or even likely) will fall between X and Y serial numbers. Well OMG my saw is between those numbers IT HAS THAT F'IN PROBLEM I JUST KNOW IT!! We all know if we sit back and think about it that's how it would happen. Sure, a delicate few - probably some enthusiasts who participate in an online community of chainsaw talk - would understand the meaning of the context of a service bulletin and act accordingly. Releasing them to the masses does no good. Releasing to dealers is the lesser of two evils. People demand this information because they should damn well have it - but they don't know what to do with it once they have it!!
Just my opinion on it. Don't fix it if it ain't broke.