It just makes sense, they've got their cars tuned in by now, Abu Dhabi is a circuit they know well so they're not likely to mess up the setup (or conversely find some amazing leaps through setup).

They now likely have a huge selection of used parts they can put on the car so they don't risk wear/damage on the parts they might need at a later date.

So if you're not expecting to be fighting for championship positions in the final race it's a no-brainer.

The others did it in Mexico which is the 2nd best option, if you don't want to use up all of FP1 in the final race for the young drivers.