The Saudi and UAE militaries are indeed something to sneeze at. Go read the comments about them from anyone in the US military whose worked with them.
https://www.reddit.com/r/WarCollege/comments/19ckc6l/saudi_a...
https://www.reddit.com/r/CombatFootage/comments/qhmbog/why_i...
https://www.reddit.com/r/WarCollege/comments/hqfatn/why_are_...
https://www.reddit.com/r/CredibleDefense/comments/fbd97k/is_...
well you don't expect them to fight bravely -- well, I don't even expect Saudis to even send their own citizens to iran
rather, you expect them to pay for the missiles and mercenaries like gurkhans
gurkhans are few and already employed, and there is no much substitution.