To be fair to him, Paix is totally untested at NRL level. He's not even proven and mostly still untested in that role at Queensland Cup level. He's as far as I can tell never played anything close to 80 minutes at Dummy Half at even Queensland Cup intensity, let alone what would be required to do the job at NRL level. Even if he could at best play some minutes, you still need someone else to cover the balance of the workload, which might well be quite a lot.
O'Sullivan is injured until the probably the last third of the season. Glenn, Staggs and Bird are all a complete lottery in the role and would require us to weaken the positions they already fill. Worst of all would be if we'd have to put Dearden there. A teenager in a role he's never played before, at a level he's barely played before, taking him away from the job he really should be doing in 2020 which is steering Wynnum around the park and killing it at Queensland Cup level.
I think literally all of those options are worse than Macca. Most of them are worse by a really long way. Like I said, he should be an absolute last resort, but if Turpin as you rightly pointed out, gets injured or even called up for Origin, we have to have a person capable of deputising for him at a modest standard, and for everything else you can say about him, Macca at least performed to a modest standard virtually every time he played for us.
All this goes back to the original point that bought this up though. He's still a far better insurance policy for us that Adam Blair, who would need a literal injury catastrophe to even come close to making our 17.