Good point and interesting comments....
I see the Ministry of Jesus as pivoting from his Judaic roots to including all the people of the earth, not just Jews. To me it would have been silly to focus on them only as what is the message here, all of you need to become Jewish?
Many if not most of the Jewish faith do not accept Christ as anything more than a great rabbi, not the son of God that was mentioned in pre New Testament books of the bible multiple times.
When he was on earth he was limited by his nature as a man, when he was crucified and rose again he was free to be everywhere at once, no more limits. Unless the expectation is for him to spread a prior religious doctrine that did not accept him for what he is - The Son of God, then why talk only to Jews?
JMHO
Citations please.
shalom b'SHEM Yah'shua HaMashiach
Forget opinions, and read Romans 10 and 11 carefully.
It is all explained there.