Too many assumptions.
LFR is THE logical step for any player to progress to normal that then progresses into heroic and onto mythic. FTR I started in LFR, I'm not an AFK'r, I don't do sub par DPS, I don't die often, and I do have TS mumble and all that balls.
The fact that many players never go beyond LFR is irrelevant it doesn't change the mentality of any player intending to progress beyond it.
You also need to appreciate that some people will not commit to a proper raid schedule for a variety of reasons mostly about real life that will exclude them from anything beyond LFR. That doesn't automatically make them poor players.
A mythic raider could say why does everyone below mythic get a legendary ring
A heroic raider could say why does everyone below heroic get a legendary ring
A normal raider could say why does everyone below normal get a legendary ring
Stop caring about what other people have. Just be happy you have it yourself. And TBF an upgrade ring is considerably more powerful than the version without moving beyond LFR
Reality is LFR is a tool to allow people to see content they can't see for a massive list of reasons beyond being shit, or as a introduction into further raiding.
You don't like it, but then make loads of assumptions about the players in there.