Hussar
Legend
It's absolutely clear that blindsight allows you to "see"; as it cancels all the various mitigating factors that would prevent you from doing so (lack of light, lack of eyes, concealment, invisibility, etc).
It is explicitly stated that you cannot hide from something that can see more than 25% of you (subject to the exceptions of specific powers granted by race, class, etc).
There are only "many interpretations" if you suspend (either willfully or through ignorance) either the commonly accepted rules of logic or the commonly accepted definitions of basic vocabulary.
I think that would be my point. I have 4/4 cover by hiding behind a big rock. The creature with blindsight could not target me with, say, Charm Person, because that spell specifically states you need to see the target. Now, I make my stealth check and beat his perception check. I move out into the open and shoot - I would say I have advantage, after all, I could be shooting from a number of different positions as well as the fact that the opponent doesn't spot me until after I shoot. I then duck behind the big rock again. I would say I would have to make another Stealth check in order to attack with advantage, but, regardless, the opponent still cannot directly target me.
Note, if the opponent moves and gets a direct LOS on me, fair enough, he's going to spot me. But, that's on his turn, not mine.