I understand what you're saying and you have way more experience than I do with them. And I totally agree with you that we shouldn't have our face stuck to the screen. That is exactly why I have the sound on and the fish icon on. Sure it might be debris or something besides fish. I've used mine enough to know it's usually a fish. I've sat in a clear lake with 15' vis and played around with it while fish are cruising under me. Pretty cool.
The Striker is decent at deciphering junk from fish based on my experience with it.
If there are fish on the screen then I usually give that spot a bit longer than I would if I don't see fish. That has paid off several times. And I know that when moving it won't show all the players like the fish I hooked yesterday. But when I'm anchored up in 15' or less and there's no fish on the screen that's a no go for me.
I really just want depth and temperature and the rest I'll mostly figure out on my own. Or not.