Okay, but is there a valid use for it on a forum? You just showed what good use it would be on a wiki, which is awesome, but what realistic point does have a forum have with size code?
Do you only speak at one volume? I for one do not sound my barbaric yawp over the rooftops over the world at the same volume I call someone a dumbass out of earshot. This is an effect conveyable through text size. I might point out, on an aside, that in the Personal Projects subforum, it is occasionally necessary to present a project using an article-like format.
When conversing in a forum, we must occasionally use emphasis or deëmphasis in ways best conveyed through styles. I often find it to use the full range of options from time to time, especially in cases where refactoring a sentence for clarity would be less clear than, say, italicizing or parenthesizing particular terms for clarity or flow management. I fully admit the amount of times I use it would be considered offensively frequent in literary prose, but this is a forum; a message board, if that brings to mind master rhetors in their togas orating in debates at a level that would put Lincoln and Douglas to shame, although it really shouldn’t when it is not generally considered a faux pas to converse using yellow smiley faces. Even text color, largely a forum annoyance, has recently found a not in any way useful or elucidatory
I am going to assume for politeness’ sake that you seriously missed or didn’t understand my first post, but if you are being passive aggressive with your insinuation that it is not “valid”, Neil... know that I think rather highly of you, sir, but you’d be challenging an established belief of mine here.
If you must know, I usually prune things when posts get about this long and flowery and irate (even to the point of just not posting), but no such mercy today.