Wondering why "On what day were you born?" is considered wrong. Only "What day were you born?" is accepted as correct. Without "on" the English sentence feel incomplete to me.
I agree. My answer, "On which date were you born?", was not accepted. I reported it as well.
Agreed. I reported it
In British English I would ask "On what date where you born?" or "When were you born?"
Even in America!
Literally "You were born date what?" , and of course meaning, "When were you born?"
Not quite. "When were you born?" can be answered in many ways that would not work for "What date were you born"
It is not correct English to end a sentence with a preposition. Example : on,at
That fake rule is nothing more than snobbery. English is a Germanic language and as such prepositions at the end are quite fine
To leave out "on" is NOT wrong