So far I am comfortable with the 5.1 changes. While I do feel that Hasty Touch, Rapid Synthesis, and Patient Touch should have their success chances boosted by 30% to make up for the loss of Steady Hand, I am fine not using them at all. It just seems a shame that they exist to only be used in desperate situations right now.
It does feel strange that the only benefits to being a Specialist are extra stats and a single specialist skill. With that said, while I feel that Careful Observation is a niche skill right now (that could change in the near future), it is useful for it's likely intended to be used for, i.e. skipping "poor" states without losing vital buffs like Great Strides, or fishing for good/excellent procs for a beefy Byregot's or for extra CP.
I feel fine with the removal of cross class skills since every crafting job has essentially the same skills now.
I'm not certain under what circumstances I'd use Name of the Elements and Brand of the Elements over say Observe/Focused Synthesis. Mayhap it is simply intended to be used at lower levels and then outgrown?
I do like that I can actually use Precise Touch and Intensive Synthesis now that they are 100% success rate. Prior to 5.1 I almost never touched them because the procs would happen when Steady Hand wasn't up or it would waste buffs. At least now if I am in a situation where I have a good/excellent proc with no buffs up I can actually hit one of those skills without rolling the dice and possibly losing both the proc and durability for nothing.
Ultimately, I am not unhappy with 5.1 crafting right now. That could change when we see how Ishgard and 3star and 4star recipes are.