這不算文法問題吧，且有很多爭議，甚至很大部分人還是持反對意見，應該不是對錯的問題。
我覺得是部分人（權威...？）對英文寫作的看法，主要是針對句子結構的美醜通順。


貼個網路上流傳的笑話：

A snobbish East Coast English Professor is visiting a colleague at a
rural university in the Midwest. The colleague takes him to the
local cafe for breakfast and introduces him to a few locals
she's gotten to know over the years, including a farmer.

Farmer: Glad to meet you. Where do you come from?

Professor: It is improper to end a sentence with a preposition.

Farmer: I'm very sorry. Where do you come from, as_ hole?