I get that, but there are certain heroes that would make sense in this universe that they would be prominent in certain spheres of life. It makes sense that SHIELD would be monitoring and even involved with stuff happening in Wakanda, Atlantis, top scientists like Pym and Banner, and it makes sense that a top physicist would be familiar with and even be an associate of another top physicist, their separate fields notwithstanding.
Anyway, maybe I'm a Marvel homer but I do trust that Marvel and Whedon won't be forcefeeding us cameo after cameo, connection after connection. They care about this stuff too.