Yeah, that is one theory that has been considered, but not adopted as policy. The base theory in use is that if a moderator is talking about a subject of moderation/enforcement, etc, it is a moderator action unless he disclaims that capacity for the matter. It should be easily identifiable by subject matter. Since I often start a moderator post with a comic relief line, I lean toward more common use of the tags even when directed at a specific member, rather than a thread as a whole.
So every time a current moderator posts in Site Feedback using normal, non-mod tagged text, that's a Moderator Action and therefore we're not allowed to refer to it, quote it, discuss it, etc.? That's ridiculous.
It's good that you prefer to use tags, because honestly, your sense of humor isn't something that everyone recognizes. Sometimes I get it and sometimes it's too obscure. And sometimes I get what you're trying to do, but it's not funny. And that's from someone who has known you here (as much as any fellow forum members who have never met in RL can "know" each other) for years. What chance does a much newer person have?
Well, if a moderator says "Do not troll" in a thread about music, you would be pretty sure to know that is a moderator action rather than a member post about music, because it about rules rather than the subject of the thread. That should be rather obvious to anyone. On the other hand if he is adding rules to a thread (rather than just reminding about base rules), or changing rules in an thread, the moderator really should highlight the post with mod tags, not to tell members that it a a moderator action, that should be clear from the matter of the post, but to make it easier for members to notice the change up.
Ever since I joined this forum (over 10 years ago), I and everyone else has been conditioned that when moderators tell people to do something, not do something, or otherwise give information pertaining to moderating, it's done in bold red, blue, or green font. It is absolutely unfair to expect people to read every word a moderator says in case something they post in regular font is something about moderating. There are some staff members whose regular posts I tend to skip over if I don't see mod-text. That's because in some cases I don't find what they say to be particularly interesting, whether in general or on that topic. I'm sure we all have members whose posts we don't bother reading regardless of whether or not they're on a formal 'ignore' list.
Saying "You should read every single word a moderator posts in case he says something official to do with moderating and doesn't bother to use mod text because of some reason or other (like "I didn't feel like bothering" - for a hypothetical example) is worse than the attitude of the staff in the apartment building I live in where I'm expected to check out the elevator every day in case there's a notice that the water is going to be shut off for maintenance (somehow they think that constitutes "proper notice" to the tenants, even though not everyone uses the elevator every day). At least it only takes a couple of minutes to check out the elevator. It would take all day to read the moderators' posts in case they say Something Important that should have been readily noticeable in the appropriately-colored mod-text.