I also think the Coerver drills are most useful in futsal and the women’s game, not so much the men’s game. Almost all of these Coerver fast footwork drills can’t be done at full speed, and they are easier to do without error when wearing futsal shoes, the studs on cleats make the moves harder. You are not running full speed very much in futsal, and you have to move the ball at crazy angles in tight spaces, so the Coerver moves work really well in futsal. The slower speed of the women’s game also made it easier to do Coerver moves, the slower you run it’s easier to do the move. Plus, unless the female player is built like a slim boy, the women’s change of direction, TBH, is brutally slow. Because these Coerver moves are usually change of direction moves, they are highly effective in tripping up the girls.
.
I think you are absolutely right that the effectiveness of the Coerver moves depend on the speed of the player. I think it's therefore easier for girls to do the moves than boys, but that doesn't mean the moves are more effective for girls. Indeed, many of the moves are named after the male players that made them famous-- whether the Ronaldo chop, the Maradona spin, or the Messi fake.
The problem with Coerver is that while it's really great at improving ball handling, it doesn't do a great job at some of the other skills. If you look at their pyramid of skills, ball mastery (where much of the basic Coerver course is devoted) occupies the huge space at the bottom of the pyramid, below receiving/first touch (which others routinely say is the most critical skill). They do give proper nods to the passing game, but the bias is clearly that if the player is able they should try to beat the opposition, rather than back or short pass it. It's very different from the tiki-taka system. Also, the teaching materials aren't all created equally (the finishing, for example, is much weaker than the ball moves section and I don't remember seeing anything on off ball movement). I've been through the goalkeeping course. I wasn't impressed..it was like they were trying to build a goalkeeping philosophy to cram into a pyramid rather than generate a comprehensive new philosophy. If we ever do get a national curriculum Coerver has its place, particularly in the early ages, but it's not a silver bullet.
My son had great success with Coerver at the U8 in AYSO...with just a handful of moves routinely able to beat slower players who didn't know about the moves. I see that less in the youngers for club, particularly on the smaller fields with less room...the emphasis is more on the passing game or run and boot soccer (I've seen both types of coaches yell at the player for trying to beat an opponent on the dribble when a passing or running option was available). And then it's not always taught correctly....it's not enough to learn the move but you have to know which moves are appropriate for what circumstances....I remember once seeing a Coerver trained striker try to beat a younger keeper on the one v one with the roulette....keeper smoothered on the one v one and the striker went flying into the goal....a toe poke or the chip would have been better options (or even a rollover towards center if the keeper has left the far post open and hesitates).