See my point? Not saying what's worse or better, but that you just went against OP's point.
I did not, and I will explain why. See, this statement...
Yeah but that's considered toxicity
...has two sides. Because, going afk is toxic as well.
Telling an afk that what hes doing is ruining the game for others, is simply an accurate statement.
But now we allow players with such game-damaging behaviour to operate under the protection of their premades. They no longer not only don't get called out for it, no, now they also get supported, because anyone who ever says a word against them, immediately faces all their friends as well.
That makes some of these players feel secure in what they do, it makes them fell as if their behaviour is acceptable...and while I don't have the numbers to prove it, the conclusion that this leads to an increase in such behaviour, is only logical.
And that is what, imo, OP meant by "increased toxicity".