(Positive) feedback loops are dangerous, even if we stop doing anything that moves things forward, feedback loops can get us to hell on Earth (quite literally) all by themselves if we reach the right conditions.
And that is why is dangerous to surpass that limit. Even if we define that today conditions are safe or that we can still move things a bit forward without too much harm, feedback loops won't stop because we want them to do and make us cross the cliff.
It is not something binary, of course, we were getting already loss of albedo and permafrost thawing and so on before reaching that landmark, but things can speed up badly eventually out of the safe zone.
And that is why is dangerous to surpass that limit. Even if we define that today conditions are safe or that we can still move things a bit forward without too much harm, feedback loops won't stop because we want them to do and make us cross the cliff.
It is not something binary, of course, we were getting already loss of albedo and permafrost thawing and so on before reaching that landmark, but things can speed up badly eventually out of the safe zone.