This is a classic resource allocation problem. Most of the time the simple basics (off ball movement, short passing game, first touch, running technique) are the things you use in a game and need to be really proficient at. So it would make rationale sense to focus on those basics, and forego the fancier stuff But a lot of the game changing moments are the fancy skill moves you see in the highlight video that can sometimes make a difference, so you also need to be proficient in that (and coaches will judge you in part of that). But the added difficulty is it takes a lot of time to get really proficient on those fancier skills, which is why things like Coerver exist, even if in game they are deployed very rarely.
Goalkeepers have the same dilemma. Besides distribution and working with their feet, their big three are catching, the low dive (collapse and extension) and the high dive (collapse and extension). Most of what they do is mostly that, and possibly the forward dive and defending crosses as they get older. But players also need to know the more advanced techniques, like the 1 v 1 smother, the k-stop body block and tipping over bar. Those skills take a tremendously long time to develop, and a goalkeeper who hasn't developed those skills will come under severe criticism...Exhibit A being David Bingham for the Galaxy who can't seem to stop a 1 v 1 to save his life.