It’s not really about intensity. Mission Space almost certainly made a lot more people sick then a really wild coaster, but that’s because it set up a situation in which peoples inner ear and their eyes were telling them different things. GotG could be a similar situation. (Also, no, Disney does not need “intense” attractions - it never has.)
We’ll get a clearer idea about whether WDW has built another Mission Space very shortly. Until then, reports of sickness by people who have ridden the ride isn’t something optimists need to downplay or explain away or something grumps need to make the final measurement of the ride. The reports so far are enough to raise an eyebrow - let’s see what happens.