What is your opinion about the rule of split infinitives? When do you usually split infinitives? Do you think it's OK to have grammar rules that might conflict with how ordinary people speak?

Split infinitives do exist now. In what people speak we can identify the split infinitive which actually contradict the original grammatical order. But it is now acceptable as people speak without grammar but in an understandable tone that makes sense! And we do take it forward.