I made a thread stating that League SHOULDN'T have outlying factors affect your lp gains. This is just further emphasizing a point I made from before. Another popular game tried this shit and it sucked. League doesn't need it. If you win, you get lp. If you lose, you lose lp. Yeah, it sucks that you can get fed and lose due to someone being stupid, but it's better than people playing sub-optimally or gimping your team comp just so you can farm lp.
Now, they're only removing it for their Diamond tier and higher, but if this is being done to *improve* Overwatch's ranked game mode, to *remove* this type of feature, clearly it's in League's best interest to not even bother.