I heard from reliable sources that it is because originally they wanted to have a blue dye, somewhat as a zeicher to techeiles and somewhat because part of the svara of the blue color of the techeiles is to remind us of the ocean, which reflects off the sky which reminds us of the kisei hakavod so it is good to have something blue on the Tzitzis. However the blue dye did not stay well and used to run a lot so the closest thing they had was the black dye. they have not changed back since, feel free if you would like to. it may not be a good reason but I believe it is true. As for the techeiles issue when the question was posed to the beis halevi supposedly he responded “I don’t wear techeiles (or what was then considered to be techeiles) because my father didn’t and my grandfather didn’t” bkitzur, we don’t have the mesora for it. Obviously there are different shitos regarding this approach, according to this story, this was the approach of the beis halevi.
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