If I’m manufacturing platforms, I’m making them to function properly on 6” diameter tree minimum. Anything past that is ok as a fringe benefit but not worth money or design tradeoffs to chase.
If I’m using a platform, and it functions at any tree diameter, I get in whatever tree I need to, that allows me to kill a deer. If a platform only functioned properly at 6” and above, it wouldn’t stop me from killing deer or carrying it. There are very few times most hunters will ever be affixing a platform to trees below 6”. On average. Expecting a platform to work well on a 4” diameter tree, and it hold me without swaying or swishing, and it offering enough cover to hide me, and it offering enough shooting room, create a very very narrow spectrum…