Then, according to your standards, if Trump appoints a new justice (making it 6-3), then Biden gets elected with a blue senate, and they change the number of judges to 11, Biden appoints 2 justices (making it 6-5, which would be the same as 5-4 anyway), that would all be fair too? It has to be, because of the 'pragmatism' of the majority party.

Taking it further, what if Biden decided to pack the courts with 4 new judges, making it 7-6 in favor of the Dems? Fair too? Has to be, right? (Because of 'pragmatism' of the majority party again. Also perfectly legal.)