Your points are good ones, but the gospel, the “good news,” is not that Christ died, but that he rose. (I Cor. 15) He conquered death, offering us that same hope.
So shouldn’t it be Good Sunday?
I just think that the guy, probably some medieval man in fancy robes, who came up with the term “Good Friday” had a twisted view of the occasion.
Doesn’t matter. The crucifixion was most likely on Thursday anyway.
Sunday should be "Great Sunday" or "Awesome Sunday".