None of the OP's concerns are an issue in my experience. We shot some cans very hot Saturday with our KMRs. You can feel warmth from the barrel, but there was no point where I felt the need for a glove or anything.
Complexity of attachment? Depends on the accessory. The QD mount stumped me for a few seconds but you can always fall back on the instructions. I'm more hands on, and don't get a lot out of reading about how something works.
As far as wide spread acceptance or standardization... It has zero impact on my gun's set up. The more options the better I suppose, but if there were never another keymod mount or accessory made, I'd still have a solid setup that would be functional for years. There's not a significant downside risk to getting a keymod rail.
"You people have too much time on your hands." - scottryan
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