"Play XIV if(cont)" and"you have a responsibility to" are not statements that coexist

[Canadane]

But they the community turns around and says things like if you're not longer a sprout, you don't have room to make mistakes

A little hyperbolic no?

When the mistakes are basic fundamental playing issues, then yes there's a problem.
Having no idea what your skills do, not knowing what AOE colours are bad, not knowing what a stack marker is, having little to no raid awareness at all.
THESE are the mistakes that are less forgiven if you've gotten 71+ levels under your belt.
Things such as not remembering fight specific mechanics or where the command is to use Target Filters or something isn't what people are talking about when they say a non-sprout should know their stuff.