I think you're right, there seem to be issues with the wave's part, I recently got a 144hz screen and I can clearly see a difficulty difference between my old 60hz screen. I cant remember exactly how I had code that, but I think it's framerate depend (a delta-time issues to be techy), thats why some people complaining and others don't.
And from game design perspective, the whole game is about knowledge, you cant disarm the bomb first try, you have to make errors to learn and progress, the wave part, the cables, all of this are some kind of fillers/ time waster, not "real puzzles", I agreed with you.