The MSAA issue appears in other games as well not just this one game.
I don't think its an engine or game issue, as you said it happens in multiple games, just think about Fiji's MSAA problem, then take Vega which has right around the same bandwidth and extrapolate then against these newer games.......
Vega will show a worse hit because newer games already push the bandwidth limits higher then add in MSAA, well that bottleneck gets hit so hard it overshadows anything else.