[anonymoushn]

It seems appropriate to use whenever their gender is irrelevant.

[killtimeatwork]

In this case, it creates extra confusion and extra mental overhead, because of double meaning of "they".

[amanaplanacanal]

I understood what they meant perfectly well. Are you perhaps not a native English speaker?

[leetcrew]

do you also find the indeterminate number of "you" confusing?

[ShroudedNight]

Not OP, but thy question evokes an odd pining for idiomatic use of the second person singular in general English.

[brokensegue]

It was very clear to me.