Wait, a tiny black speck and you're still apologizing? @fionabutler, that is some next level perfectionism right there! Honestly, in clear glass, the tiniest thing can look huge because your eye just goes right to it. I'd probably be the same way, staring at that one spot forever. It's crazy how something so small can feel so big when you put all that work into making something perfect.
It's wild how this happens everywhere. You see it in shared kitchens where one person's "clean" pan still has grease, or at work when someone half does a task. That tiny bit of junk left behind makes the next person's job way harder, and it all adds up. It's basically passing a small problem down the line until it becomes a big one for somebody else.