Kevin Na resigned from the PGA Tour so he could play in the LIV.
"I'm a journeyman." That's how I read his decision. He's in the same world as Ricky Fowler.
It's my view that a lot of people look at the PGA through the lens of who won the majors while the majority of the tour consists of these "journeymen." They know they aren't good enough to contend to play, and win, the major tournaments (including those tournaments that aren't major's, but huge tournaments in their own rights—like the RBC Heritage in Hilton Head.) But they know they're good enough to make the cut's consistently; good enough to bring home good paychecks each week.
That's Na.
What I find here that I've not seen many mention is this will have its effect on the majors. By resigning from the PGA Tour these players will no longer have OWGR points awarded each week. They'll get paid well but won't be factors in major tournaments—they'll have no way to qualify.
That said...does a player like Na go through US Open Qualifying like you and I could?