Lots of things to consider. Ultimately it doesn't come down so much as "strength of field" as it does "strength of money."
This past weekend there was a WGC event in Shanghai, the purse was over twice the value as that of the Sanderson Farms event held this same weekend down in Mississippi.
And while the perception is that these WGC events boost the tour schedule with regard to getting the top players showing up and playing (because of the bigger purses) the reality is that a lot of longstanding non-WGC events are indeed impacted because of that.
The Bryon Nelson is the classic example... one of the oldest tournaments on schedule (perhaps the oldest) that, by the way, generates the most charity fund raising revenue of any of the other tournaments on tour. So you have the WGC event in Mexico three weeks prior. Then you have the Valspar. Then you have the Bryon Nelson, then you have the WGC Dell Matchplay. Not to discount that a lot of players have more and more gradually overlooked this tournament since the passing of Byron Nelson back in 2006.... but the primary reason is because of these enormous WGC purses happening two weeks prior and a week later. Most of these top players are taking the week off prior to playing their next event. It's been this way for a while now, no news there.
When the PGA moves the PGA Championship to May in 2019, what impact will that have on these non-WGC (normal purse) events?
If you double the purse and essentially guarantee the top players a paycheck regardless of how they perform - they're gonna go where the money is.
So now we basically have two tours within one tour. You have the younger, lesser established players competing in these non-WGC and non-major events, then you have the top players competing in the WGC events, the majors, and the FED Ex Cup playoff events. And those top players, sensing that these huge purse tournaments are where they need to play, are forgoing these traditional tour stops, because obviously there's more to be gained winning the Dell Matchplay, even if you play horribly, but especially if you play particularly well, versus playing in the Byron Nelson the week prior.
And with as much money as these top players are earning - you better believe there's very little motivation there to play back-to-back weeks.
Thus my argument that it's no longer about strength of field, but strength of money.