So how do you know, VGK?? How do you know that among your beloved random encounter trash, there isn't one that was supposed to have visible enemies, but due to a glitch they don't actually appear and the devs, a little embarrassed, just sort of decided to keep hush on it?
Let me turn this on you, then: you were the one who originally made the claim that random encounters are glitches in game design. That they are unintended. Where is your proof? Because your idea needs some serious explaining. It's difficult to believe that this would be a glitch in the vast majority of JRPGs (over how many consoles and how many years) and that rather than using the time and money available to them under the best case scenario to go with the idea they actually want (assuming, of course, that this wasn't the idea they wanted), that they'd leave a significant glitch in their design in the final product and reinterpret it as an actual gameplay feature.
"vast majority of JRPGs (over how many consoles and how many years)" That is your argument. You're appealing to the fact that multiple games do it. To you, it couldn't be a glitch, merely because the idea of multiple games having the same glitch would be too absurd. (even though it is for all intents and purposes what is happening, as your "accidentally invisible" visible enemies example illustrates)
Also, not vast majority. Many recently released JRPG's no longer have them such as Persona 3 and Persona 4. It's actually pretty pathetic you would try to overstate how common random encounters are. They are basically rare now if you discount ports and remakes. Why they haven't been stamped out completely is beyond me. That's what grates my nerves, it's pretty much objective at this point yet japanese devs want to drag a clearly dead horse out of the grave time and time again. The devs need to get with it and let go of random encounters. The rest of the world is gradually ignoring them more and more but you know what, they deserve it. The worst thing western devs give us is sports games.
"reinterpret it as an actual gameplay feature." reinterpreted by who? Games don't interpret themselves, we interpret them. How old were you when you first played a JRPG with randomly triggered encounters? I played FF6 on SNES (they called it FF3 damnit) back in like 1995 I think. Beat it, loved it. Cried whenever my brother accidentally deleted my save. But I was young and didn't know any better. The game is trash.