If it makes you feel better, while someone with blindsight is able to interact with the objects in front of them through a subliminal awareness of them they can't form memories of those objects. Memory is actually very useful and consciousness[1] is necessary for its formation so you don't have to worry about non-conscious lifeforms out-competing conscious ones.

[1] In the sense that is related to blindsight. Maybe someone with blindsight still has philosophical qualia of the objects they say they can't see, I don't know