It's just that I've been trying to tire myself out by reading fics. I have folders of favorite authors and then one for various, and I've been reading some of the old, old "various" ones, which had a bunch of fics where Ezra is misunderstood, or mistrusted, and ends up hurt and has to tend to his own wounds, and they mistreat him horribly and I was getting sick of those. Deleted them all.

someone had put together a vid or a picspam where they went through the whole series, piecing together whether he was a lefty or a righty

I remember that, it was a vid! I think it's somewhere on YouTube. I wonder if that was just the character, or if Tony's ambidextrous too.