All I'm saying is that if you defend one implausible, super-powered character and not the other, it's not because one is a Sue. It's because you (not you personally; a hypothetical "you") like one of them. If we were to approach this objectively, we could find pros and cons for both of them. All things being equal, it makes no sense to call Rey a Sue but not Luke, as you can justify both characters' skills and levels of power equally well. What works for one works for the other, and main characters in SW have not ever been plausible when it came to what they managed to accomplish - not Luke, not Anakin (Space Jesus), not Rey. Seeing as the farmboy who shouldn't be able to save the galaxy like he did does not get the treatment, but the woman who spent her whole life surviving under rough conditions and making a living by knowing how ships work does...well, it becomes obvious that this isn't about character flaws at all. It's about dismissing one with a term that has lost all meaning - for one specific reason. It happens way too often, and the over-the-top derision is almost always directed at female characters who - I repeat - are seldom better qualified than their male counterparts. Why do you think that is?
If it were being used in equal measure, that would be okay. That, however, is not the case.
I just used SW as an example because, well, it's a thing that's been happening ever since TFA. Burnham is the same. She isn't perfect. She doesn't know everything. She isn't always the POV character. She even screwed up on a cosmic level once. But she gets the treatment. Spock, who basically knows everything, doesn't. Kirk, who was super young when he became a captain, who keeps saving the galaxy and who scores with all the alien babes, doesn't. The term applies to none of them, but she gets it thrown at her anyway. It has nothing to do with her character being a self-insert or perfect or whatever. She is none of those things. None of them are. They are protagonists, super competent, sympathetic, but not perfect. That's the entire point, and I'm just so tired of this happening all the time. People can like a character or not, but they should reflect on their reasons for doing so. In the end, they may not like what they find.