This. Just had a 4v5 where Cait never connected. No ADC whatsoever. We still managed to keep it even and would have had it, as decided by both sides, if we had an ADC. Loss prevented? No. I have to lose league points because Cait has a shitty ISP, bad router, or just decided they have something better to do.
"Players will not receive loss forgiven for personal connection problems, such as issues with your router or ISP, nor will losses be forgiven for freak incidents with the client (such as bug splats)."
This needs to be fixed. There is no need for anyone to lose IP because one of their teammates is unable or unwilling to play the game. It is absolutely one of the most frustrating aspects of ranked play and plagues everybody.