I agree as well. I thought bringing Crosby back as alternate-Yar/Sela only cheapened the sacrifice the character made in season one.
lol. And I don't use lols often. You call Tasha's death a sacrifice? She simply walked in one direction and died before she even finished her sentence. How can you cheapen something that was written and executed on the cheap? And regardless, I don't think Tasha's death was cheapened by Yesterday's Enterprise because this wasn't about that Tasha. It was about the one from Yesterday's Enterprise. She was the one who was willing to sacrifice herself because she knew that once they restore the time line, she will be dead. That Tasha made the sacrifice, not the season one Tasha.