I was curious so I went back to the 2018-19 season, which was what I would consider the last normal season before COVID and LIV. Pulled 3 random, but big name, events to see who was in the field. A sampling:
Genesis: JT, Rory, Scott, DJ, Hideki, Rahm, Cantlay, Bryson, Finau, Xander, Bubba, Tiger, Fleetwood, Kuchar, Sergio, Homa, Mickelson, Niemann, Cam Smith, Spieth, Hatton and Oostie, etc.
Bay Hill: Fitzpatrick, Fleetwood, Rory, Stenson, Bubba, Poulter, Hatton, Hideki, Kaymer, Fowler, Zach Johnson, Bryson, Niemann, Reed, McDowell, Snedeker, Rose, Mickelson, Koepka, Oostie, Lowry, and Day, etc.
Memorial: Cantlay, Scott, Kaymer, Hideki, Spieth, Tiger, Rose, Fowler, Xander, Bryson, Niemann, Hatton, Homa, Stenson, Donald, Oostie, Fitzpatrick, Rory, Kuchar, Day, Mickelson, Finau, Cam Smith, and JT, etc.
I guess if you want to quibble, each one has a guy or 2 missing. But overall, those look like pretty good events to me and I'm sure you could do this with many others. Having a hard time with the "it's worth destroying professional golf because the best weren't playing against each other" mindset.