Cliffhanger can be good, let's say season ending of a series that already got the next season's approval. It makes you keep engage the story, there is a mark in your head until you see the next season. It does not necessarily something bad but mostly something curios. Recently though, the meaning of it shifted and they corrupted the idea. They are putting the cliffhanger for the sake of it. They don't have any idea how to take the next step, so usually they go with it looked like that but actually it was not or worse they keep the scene short for cliffhanger purpose, it's like stopping a sentence halfway through. That is just annoying, they don't make people curious they aim to make people furious and try to engage that emotion.
I am not sure what will Nyx gonna do or what is she planning but I'd welcome a good cliffhanger and refuse tease-hanger.
Personaly i always preferd a clean end and then the next season, but yeah these kind of cliffhanger are ok, or if it is a large episode which is split and you know you just need to wait a few days.
But as you said, most cliffhanger nowdays have no purpose, like cutting scenes short or 'but actually it wasn't as it looked' those two piss me off and if a series does that often i usually just stop watching.
That being said, i find it already hard to find series or movies which interest me nowdays.
Dunno, most of the new stuff seems to be aimed at younger (or sometimes i really think dumber) generations, and i have little interest watching teen drama. Or when they insert dumb diversity quotas or worse political crap which is often portrait in a 'in your face' way and if you don't agree your wrong/evil/the problem etc, i really can't stand that when i just want some good entertainment.
These fuckers pretty much ruined all scifi shows i once liked.
Nowdays you get Star Trek...were you can listen endless whining of a gay couple in the machine room and the bridge is filled with crying and sobbing every other scene

Patrick Stewart doesn't play Picard any longer but Patrick Stewart plays Patrick Stewart and somehow the whole 'better future thing' also got down the drain.
Star Wars...do i need to say anything ? I stood up and left the cinema in the as i saw the dumb mary poppins scene as i couldn't stand the garbage anymore.
Never got warm with Battlestar Galactica either, had not much left with the show i liked as kid.
And i'm still waiting for a good movie like Beverly hills cop...or the Bud Spencer/Terence Hill movies
Meh, sorry i'm just ranting at this point