I think I figured out a retcon to make sense of TESB and TFA. In universe when they refer to a system, they do not mean star system, but a group of worlds or moons as a political body. Otherwise the Falcon in TESB would have spent months or years traveling from Hoth to Bespin. but if Hoth, Anoat, and Bespin are all in one solar system but comprise 3 political bodies, then the Falcon can traverse that distance in days. The same with the people of Takodana seeing the blast that destroys the Hosnian system (which is portrayed as a planet with several moons). I still think Takodana should be further away than that and them seeing was a silly plot point.

How this quite relates to TFA, I’m not sure, but the discussion that was going on made me think about it.