The trend seems to have started with whiteware (yes, I'm aware of the irony), with black fridges, black washing machines, and worst of all gloss black microwaves with black interiors and black touchpads labelled in black on a black background, but recently the brain rot has moved across to electronic test equipment, with the same black controls on a black background proliferating across multiple vendors' product ranges. You'd think of all people engineers would prize functionality over appearance, but apparently the marketroids in charge of selling to them don't.
The only benefit I can see from this black-on-black-with-more-black design aesthetic is that I can take a cardboard box from the bin at the local hardware store, spray-paint it semi-gloss black, add the obligatory 1,000,000lm blue LED in a corner, and tell people it's a $50,000 Keysight spectrum analyser, because they won't be able to tell the difference from the actual item.