And, of course, as a "professional game designer," you've never actually written a rule that you had to change later (as Steve did with the GEV and Heavy Tank rules you mentioned). Errata is apparently something you've never issued for any of your "professional games?" (And, BTW, what games have you designed and sold? I'd love to hear the titles.)
As far as TFT goes, it would have been awfully hard for Steve to have changed ANYTHING, since he no longer owned the rules...and now that he does, I foresee a lot of minor changes over things that he maybe feels need some tweaking. Speaking as a game designer myself, I think your puritanism on this surpasses the bounds of reasonableness.
Also I didn't say your arguments were strawmen, just that your examples were -- since no such situation would ever be likely to arise against anything other than an idiot. (Which means you are NOW making a strawman argument, since you contend I said something I never did, but nice try). And you got the facts wrong anyway. Attention to detail is important in a discussion like this, and if you can't even get the underlying rules that you are using to "prove" a "mistake" was made right, why should I take your argument at face value?
Finally, "Steve didn't specifically say he was going to change it" is your ending argument? He didn't ever say he was specifically going to start charging XP for Talents either -- until he did it -- and even there, we have no idea how the rule will finally come out (or even if it WILL finally come out, for that matter). Which just goes to prove my point; all this angst over a rule that we don't even know the final content of seems...premature...to me.
I won't even bother to address the issue of the +4 DX for the Arquebusier -- if you've ever seen a picture of one firing his weapon, you can see precisely where Steve got that idea from. Which is not to say it's the way I would have done it, but then, it's Steve's game, not mine or yours.