Foxi, all randomly triggered encounters are constant. If something happens every 20 seconds, that is constant. Now let's say you randomize it a little and make some encounters happen anywhere between 10 seconds to 25 seconds. (it's decided randomly) How is that any better? It's still constant! It's even worse now since they will usually occur more frequently than if they had been 20 seconds apart.
If they were exactly 20 seconds apart, and not random, how is the player supposed to know? The player is unlikely to notice unless they take our a stopwatch and time it. Only through the sheer repitition of the encounters, the player starts to conclusively notice some degree of randomness which they aren't simply imagining. (e.g. those cases where the next encounter begins almost immediately after the previous one)
The "random" part of randomly triggered encounters is probably the least significant aspect of them, and arguably just makes them worse. How is it any better if your browser window crashes once every 20-40 seconds as opposed to once every 30 seconds on the dot. In either case the browser is unusable. In either case the browser is constantly crashing. You say that random encounters should feel random, but no Japanese RPG has ever had offered encounters that had felt "random" in the way you describe. After every given encounter the player is well aware that the next encounter is imminent. That could not be described as feeling random. "repeated" "repetitive" "constant" "nonmstop" and "endless" are better words to describe it. As is "unplayable". And that knowledge of knowing the next encounter is coming up is partly what destroys the experience in RPGs since you know none of it is real, it is just a hackneyed and stereotypical by-the-numbers exercise in systematically rapid firing encounters at your face so the game isn't too short and so you are leveling up consistently. (you say RPGs aren't about stats? Then you should hate randomly triggered encounters!)
