I'm close to having all my crafters to lv 55, so I figure it's a good time to start thinking about specializations. I know you can have only 3 at a time but I have a couple questions about which ones to pick.

Which specializations pair with each other best or are more interdependent on each other? Such as ARM/LTW/WVR or GSM/BSM/LTW?

For someone that is primarily a solo player, are there any sets that tend to work better than others? Not necessarily the ones that are most interdependent, but generally most useful regardless of interdependencies.

Is it even worth going for specializations as a solo player? For me, crafting is something I do on the side to help friends, but isn't really a focus of mine. Some of the skills seem useful, but I'm hard pressed to say they look essential to me.

Any other general advice about what to pick?