No one has to impress anyone here.

But I will say that this is a venue for people to communicate about thoughts and ideas.

The written word is how that is done.

To not make an attempt to give those words the best possible chance at effectively communicating your thoughts is doing your thoughts a disservice. It leaves those who read them confused as to exactly what message you are trying to get across.

Sometimes, if the grammar is bad enough, it actually reflects so poorly on the thought itself that it would've have been better left unshared... rather than shared but butchered.