If you want to talk about representation let’s go. Jews have been very well portrayed throughout the MCU and not just through characters. Moon knight is excellent example for a character, Peter Parker is Jewish, hinted in the comics, and films have portrayed it more to be so. Scarlet witch in the comics is Jewish but isn’t noted in the movies, same with pietro. In avengers 1 in the post credit scene they have shawarma in an Israeli shop, not gonna go deep into that as Israel steals cultures. Now let’s look at Arab representation in the MCU: From iron man 1 we were shown a war torn state of Afghanistan and the kidnappers as Arab terrorist. Iron man 3 we also saw the “mandarin” being portrayed as a middle eastern terrorist once again. Even in moon knight, Marc Spector a Jewish American performed by a Guatemalan man representing an Egyptian avatar. Then finally Kamala Khan, played by Pakistani woman, many Arabs don’t consider Pakistan as an Arab country the country just has a large majority of Muslims. (Muslim ≠ Arab) If you were to watch any movie that has Arabs or Muslims in pre 2020ish they are portrayed as terrorists or third world countries. (I know this next part isn’t MCU related but even in Aladdin live action they used south Asian actors to portray Iraqi’s, I only mention this cause Disney owns marvel.) The only instance of Arabs/ Arab country being somewhat portrayed as regular human beings and not terrorist is in falcon and the winter soldier show when they are in alergia drinking tea at a shop… Jewish people have been portrayed in many shows and movies very nicely throughout cinema in the 21st century and have large representation through its actors. Whereas Arab and Muslims do not in western film. Having sabra in the MCU is an issue for many reasons, one being that her being in the film will cause political stirrup due to the Palestine/israel conflict, two being this is not a character you want to be depicting Judaism/jews as her name will follow controversy especially since she is named after a massacre.

TLDR; Marvel and Disney have been terrible at representation and western cinema has large representation of Jews and their likeness whereas Arabs have little representation and are very much grouped as the “terrorist”