Except what qualifies "X" as more powerful while "S" is weaker? The only indication to the average person is with price. Not to mention, they literally just had an Xbox One X and Xbox One S.
I'm not sure why you were so quick to jump on that with handheld titles when I clearly said consoles, not handhelds. I phrased it very intentionally, and I would think it's clear I'm not stupid enough to forget Nintendo consoles.
And "Super Nintendo Entertainment System" is a clear difference from "Nintendo Entertainment System", the actual names. A single letter is a bit vague, and it's not nearly on the same level.