Another issue (than the exceptions to the exceptions) is that there are a large number of different English Languages. For example, Australian, American, Scottish (do I have too many "t" s in Scottish? not enough?), Canadian (eh), variations over time (is Shakespearian still the English Language? Chaucer?), the Islands of Great Britain has more dialects than I have fingers, several in London alone.
I suppose there is an ideal (Queen's?) English that most speakers depart from in some ways. Or what the BBC broadcasts, mostly. Maybe just selected announcers. Some of the Sports Announcers haven't spoken English in years. Maybe I generalize from what I remember from broadcasts in the USA.
I suppose in the final analysis English is what gets taught in a school's English classes. Most of the time, not even the teacher speaks like that.
I seem to remember Winston Churchill saying that not ending a sentence with a preposition being the kind of nonsence up with which I shall not put.