in chess, you are a new pro.
(using random numbers)
you have 1000 elo
you beat a chess player than has 1030 elo
you are now 1030 elo, yay :D
now its time to fight a 2730 elo chess player.
the bonus LP gain would be reasonable if you played vs a gold 1 when you are gold 3.
its supposed to be a gain you get, not because you are at impossible odds, but because RIOT CANT MAKE TEAMS PERFECTLY EQUAL.
ok, would need more miliions player for riot to be able to always give us perfectly matched team, fair enaugh i dont mind.
but that's not what happen right now, they intentionally go out of their way to stop you from changing elo, which make it way harder unless you are a high plat at least playing on a gold account that would play with plats.
there is no reason to make changing elo that hard since other game dont and its going way better like that.
(not properly explained but im bad at it)