I do not agree with you, we give more importance the fact of being called blood elf or high elf than themselves
The name of blood elves we have already said it thousands of times is something symbolic that the last true prince of the high elves kaelthas announced, if kaelthas had not done that the people of silvermoon would continue using blue, or if many believe that blue is for the alliance xd
if high elves return to silvermoon it is because of the source of the sun, and obviously they would change their colors, many of them did not leave because we were called blood elfs, but because of sucking fel, which they considered unworthy
The other question is to accept who is lothermar, he does not have enough nobility to be the one in charge, it is very possible that in silvermoon or of exiled elves who return they are from more important houses than lothermar’s but it is not something that either blizz has expanded a lot