Points are awarded to those who points themselves.
Realistically, no. But should as in recommended, yes.
If I read your username I'm going to read/say it in my head, so I'm going to attempt to pronounce it.
If every username was just a long number, I'd probably start to find a pronounceable, and specifically memorable substring to remember. A username of "846768556888434", I'll call you "34" from now on.
In the case of OP, "YICHM", you'll probably just be called "Y-CHIM" or maybe "Why Jim". Is that your name? No. But is that what I'll remember, probably.
But even pronounceable names, like mine, probably get shortened. Just "Mimic" or just "Jar".
Which is all just to say I'm going to try and pronounce it no matter what you have for a username, so if you want others to pronounce it the same way, it should be pronounceable.
I change up day to day. Today was over easy. The other day was scrambled. Before that was an omelette.
If I'm forced to pick, just eggs, it would be scrambled. But omelettes allow lots of things to be added, so they win for that category.