The ones that piss me off are when there used to be a good thing to do a job, but someone has decided it is old fashioned, and now we have to have a new thing which is shit.
For instance, in cars, why are handbrakes buttons? I want a nice, big, slightly phallic lever please, that "talks" to me with real action about what I am doing with the car and won't let me down.
I am studying and all our "books" are now ebooks. this makes them so much harder to flick through and find things you have seen once. Actually retention is poorer too. I knew this before from reading novels on kindle as opposed to on paper, but it mattered to me less as I wasn't going to be examined on the novel. Young people say this too, not just old people like me!
In open book exams it really is a tough call whether it is worth bothering to refer to the text that is supposed to be your reference, as navigating around it takes ages. We're given a special non-searchable version, which is a clean copy and doesn't contain our highlights. I don't think we should be examined in the same way as others were in the past with paper books; I think there should be allowance made for what a pain they are to navigate when the one feature (text search) that makes them arguably better than a paper book has been taken out (which of course any real professionals using real ebooks for reference at work would use first).
the worst thing is tutors teaching on whiteboards instead of blackboards. When I was a kid in education, someone teaching anything a bit complex would start out on one corner of the board and work through everything, leaving it all there, so that you could always see any part of of it that had already been done and really see how the calculations unfolded. Now tutors use white boards they flick around so you can only see the bit they are doing / showing right now. You have to spend so much longer unpacking it all again in your own time, because you effectively have to do the real part of it again, the part where you see it all together and can remind yourself where everything in the final equations came from. People are always asking "please can you just show me such and such again" and the tutor will flick to that, just as you (or someone else) is just about to get something to fall into place on the bit you are looking at now. This system is a million times worse than an old fashioned black board and I don't know why it is used now, or what is supposed to be better about it.