SH, I can’t agree with that. I have no knowledge of the technology at all, and didn’t even know the name, but accurate parsing and the briefest use of Google was enough to work out the two alternative clues. It’s a pity they were unnecessary, perhaps, but they can’t be classed as unfair. I think naysayers should be careful not to project their dislike of the subject as flaws in the puzzle.
38a is a splendid clue. You need to think of two different spheres of primate. 41a requires the replacement of the last letter of the alphabet in a Buddhist priest. In 1d a stop is a woodwind instrument where an o is replaced by a Scottish (from Moray) word for search