Some DoH classes really got the short stick with cross-skills, having maybe one that is used in some rotations but not all, others have several skills used a lot (CUL for example with Hasty, Steady Hand II, Muscle Memory and Reclaim is a nice safety net).
Makes some classes never having to think twice what to "activate" as their 10 cross-skills, for some it can be a choice between safety (Reclaim) or better quality (Tricks of the Trade) in typical endgame rotations. Pretty unfair.
Plus there is the hassle of having to activate/siwtch what cross skills are whenever we switch to a different kind of rotation, and if we forget to do so the synth fails.
Makes little of sense as well, why would a craftsman suddenly "forget" how do do something? (for battle jobs that can make sense, if you attune yourself e.g. to the destructive side of magic then healing & protection don't come easily to you anymore)
Therefore I say: Begone, limit of 10 cross-skills at level 60. Won't be a huge game changer in terms of what we can craft or not but remove unfairness to some classes as well as a needless hassle.
If that is not acceptable, then at least giving us the option of having several different "sets" of 10 cross-classing skills ready so we can switch with one click instead of manually shuffling every single skill around that needs to be switched for a different rotation.