I read your post and was prepared to call you a wimp for complaining about the weight of Foams. Because I've played and still play in them and never saw the issue or the weight until...
I said let me go grab a pair and see if I can tell the difference with the weight. First I went to the website below to check the weight of some shoes.
https://nikelebron.net/weightionary/
And they are one of the heaviest shoe there!
But I have Foams sitting around so I wanted to see if they were actually heavy.
I moved two boxes and and then picked up the Foamposite box and said "D*MN THIS BOX IS HEAVY"!
I took the shoes out, had the Foams in one hand and lifted several different shoes in the other hand and yes.
The Foams are heavy!
When I put them on I don't notice though.
Lastly regarding shoes weight and cushion corresponding to performance. I'm not affected by weight or cushion but I do know that Steph Curry doesn't like too much cushion in his shoes for performance reasons.
And no, these dude's complaining aren't Steph!