So what's the point of showing the monsters still being alive at the end?

[neatoman]

So the show is kind of infamous for introducing characters that never return or at least don't come back in any meaningful way. The Turtles battle all these monsters and nearly every time they're shown to still be alive at the end, promising a follow up that will never happen.

What is the point of that? It just creates more and more unresolved plotlines, it's pretty frustrating to be honest. Think about it, what does this actually imply? Look:

1. Snakeweed is still probably trying to eat people
2. The cockroach thing may very well regenerate
3. The Newtralizer is still alive (granted, he'll probably come back)
4. The mushrooms are still around
5. Pizza face was ultimately proven to be real in the Mondo Gecko episode
6. The Creep was implied to regenerate
7. The Chimera is still haunting Northampton

So why even imply their survival if they're probably not going to come back?