Crescent Pulsar S wrote:"Uncontrolled" doesn't sound like how the Door of Time works at all, at least as far as the manga is concerned. I don't ever recall it not being reliable in any way. While it's true that time travel can be accomplished in other ways, the Door of Time would still be of interest to those who have not managed time travel themselves.
The point I was making about Crystal Tokyo is that there was nothing seen or referenced that would contradict Saturn not being a problem if left unsealed. The only problems that come up during those nine centuries had nothing to do with Saturn.
The gates of time are extremely dangerous unless you know how to navigate them...
Most Sailor Moon stories I encounter have fan fiction authors making it work like the Guardian of Forever from Star Trek (they may not call it that, but that is what they do). This is actually a large stone structure with a oblong opening in the front that allowed for viewing and scanning of any history asked for, and to jump through to where wanted if the jump is timed correctly. It is run by I what I guess you could call a sentient interactive AI, that was never made exactly clear, but it is close enough.
This is used by many to have Pluto able to use them like a TV to spy on and know *everything*. Which really is not how those gates work at all.
But equating the Time Gates to that is incorrect, they are not a viewing portal one merely jumps through, nor is there any interactions or dialog from it.
When using Sci Fi series references, closest is actually probably Time Tunnel, mixed with Voyagers. Time Tunnel actually had to be walked through, and even viewing stuff through them was tricky. Voyagers had no such viewer ability, but had tons of dimensions and times could end up in with the slightest misstep of the jump...
That last is important. The Time Gates as depicted in the Anime when they are sent forward had specific rules. Pluto warned them all not to deviate from the set path (and it was a long path, not any mere opening or simple corridor) or they could be lost forever in time and space. At no point is she actually shown viewing time using those gates.
That does not mean she cannot know future events, or other things that are chrono based, merely she is not shown using the gates to do them.
EDIT: as for threats... the biggest threat to Crystal Tokyo was actually Chibi Usa... she inadvertently caused all of it after all.