I haven't bought a single weapon or piece of armour from a store yet. I just woke with what I steal. I don't really capture animals either because Linde works well for me right now. I'll probably have to start capturing them more often though. The ones I have captured have been pretty crappy so far.
I have used Concoct once in battle. Didn't like Alfyn at all, his story was pretty cute but hated him in battle. Probably because he was the last ch1 I did and everyone else was overpowered compared to him, but I just didn't see tangible benefits that his job added that I didn't already have covered.
I like to use Capture as a way to end the battle early against annoying beefy enemies. Like the upgraded Great Concords and stuff. Though, I've had a Concord pump out 1500 damage against a broken enemy, which is huge at my level (23ish).
H'aanit is my main but she does most of her damage by straight up attacks. Warrior subclass means she has 4 weapons to buff her Phys Atk and 4 different ways to break enemies, which is amazing when she procs Second Helping waaaaaaay more often than 50%.
One thing I'm at odds with this thread with is Alfyn. Did not like him when I played his first chapter and have left him to rot. Is Concoct really that good later on?
Currently running with:
Hunter sub Warrior (see above)
Cleric sub Merchant (wind is traditionally on white mage, so this makes sense to me)
Scholar sub Dancer (dark mage with massive Elemental Atk)
Warrior sub Thief (Incite and evasion aren't working out like I hoped they would... might change this if someone has a good tanky build)