I would put it like this.
If you were riding an event or competition with other like skilled individuals that would expect riders to be taking advantage where they can....that's one thing.
In a group or recreational ride, and particularly when riding out on 'the road' where unexpected situations can arise, such as animal, trash in the road, and such, it leads to very dangerous situations and people can readily end up hurt outside that expectation.
I wouldn't do it. I don't do it.