The point of grammar is to allow ideas to be expressed as succinctly as possible. To that end, proper grammar is important. However, as a reasonable person, I won't stand for prescriptivist nonsense. Language is what its speakers say it is.
However there is one grammar "rule" that I find ridiculous and never respect or recognize, and that's that there is anything wrong with split infinitives. I honestly doubt anyone today besides middle school English teachers have a problem with that.
That's because it's not a real rule.