“Does it have a magazine that staggers rounds, to allow greater capacity?”
If I need more than 21 rounds, I shoulda brung an AK.
“Does it have polymer coating on movable parts, to reduce wear?”
That’s an innovation that makes the weapon less simple. Rarely a good idea, IMO. It will become more apparent how these innovations hold up after a few decades.
It’s been a few decades. Glock is on its 43rd model and still going strong.