I can confirm that iLok license manager and the physical key have zero problems under 14.3.
I had reasons to move to Sonoma OS but no reason to update past 14.3 even to 14.3.1.
I'm not sure why an iLok issue would involve Logic per se. There are no interdepencies with a DAW I wouldn't guess.
As to formatting other than Mac OS Extended (journaled), I strongly recommend to change your mind, regardless of what you may have been told. I'd wager things would change for you.