Well golf is slowly becoming a sport for athletes, at the top level. The shift began to happen when Tiger entered the game, he was not the only one at the time. It just became obvious. Then video, next technology with launch monitors and more recently force plates has brought a new era of players able to fine tune their technique to greater efficiency.
Add to that even better physical prep, nutrition, recovery and you start getting golfers with sport injuries coming from overwork and or exceeding their physical/joint limits like in many other sports before.

As for Aoi's swing, I think I've seen at least once her downsing coming back to her static stance at impact.
It makes sense for a non golfer and to spare some anime frames. But it totally isn't what happens in a golf swing.

As for form, Fred Couples, Jim Furyk and Cameron Champ all have very different golf swings. So much so it feels crazy they are all able to be that good at the game of golf. But they all share a same form at impact. The difference is Furyk loses distance, Champ seems to have physical problems linked to his swing, Couples has the less demanding and most fluid swing.

Myself ? Mediocre for the moment but I have fun in a tidy place and can walk a lot too.