LI hm can not be one-shooted through to the end boss lmao. If that did happen, you were doin SM or it was bugged / some was using an exploit.
LI is mechanic intensive and atleast the tank and one dps has to know what they are doing cause there aint a single tank in this game that can bring down the droid's 370k health bar by himself before that thing enrages. And the platform boss requires a healer who KNOWS how to clense and use his healing rotations efficiently. And the last boss requires everyone knowing how to do their role (especially dodging those satchels).
If you know what you're doing, can be cleared in 30ish minutes give or take 10mins. If you dont know what you're doing you're going to wipe ALOT.
I've one-shotted it dozens of times. It really is an easy instance if you know what you are doing.