Horrified at Torrified? Or the Horror of Torror?
These being electric guitars, the wood surfacing of the fretboard would seem to have precious little to do with how they sound. But I’m sure when ivory gave way to bone and plastic for the tops of piano keys, pianists were horrified for similar reasons, or non-reasons.
No, but the fretboards on guitars are usually only oiled and not finished. Ebony and rosewood are incredibly dense and smooth without requiring a lot of filling of the grain, and they (rosewood in particular) exude a natural oil and makes them easy to play. The woods are chosen because they last well without wearing, they exude a natural oil making them easy to play, and finally for looks.
So it's not sound - it's playability.
It's not just guitars. Ebony's used on the fingerboard of violins.