Fyldewhite
Tour Winner
I believe the reasoning was less about attracting new players but more about keeping old players. I understand there was significant evidence of numbers leaving clubs (and the game) because they couldn't keep up with their handicaps.
I think in practice this will mostly be the benefit. Currently, new players tend to improve quickly, they tend to want to get a handicap and then lower it, and nearly all the time they manage to do this. Those who can't improve enough to get to 28 (36) will tend to give up, drift away and decide golf isn't for them. That's not a bad thing, good that they tried but it's not for everyone. But for those that have maybe been active and competitive members of clubs for possibly decades I can really see the benefit of drifting up from 28 as their ability declines and still being able to meaningfully participate. That can surely only be a good thing.
As for the "rest of the world" system? Can people enjoy golf playing off a 50 handicap? The same could be asked about 25 handicap from a single figure golfer......but they do enjoy the sport and why shouldn't they? Yes, there has to be some limit and it has to be good to have the same system globally. Big wrench but I'm sure this will come in sooner or later and we maybe capture some of those above who currently drift away due to a lack of ability who nevertheless love playing.