I don't often prioritize machinery as I dislike water maps/prefer doing the cuirs thing, so I just farm them if they aren't supportable by food surplus (otherwise I'd run cottage on them). 2f+1h is roughly equivalent to 3 hammers with slavery at lower pops in the earlier stages, where you won't be able to grow up much anyway so you might as well whip. Work them to get free hammers towards current project until the next whip threshold or when waiting for anger to subside. Forges make it sustainable for longer even as you grow up past the early game happy limits.
After workshops start pumping up, they are a logical next step if you want to move away from whipping to working actual tiles for production, but not until they at least get one of their bonuses first (such as at Guilds or in Caste). A simple 0f 2h tile is wasteful to work in my view, as your surplus food could be going towards supporting better tiles or being whipped away. I'd rather work a 2f tile instead since it will eventually support another whip or allow the city to avoid starving when pop becomes important. Exceptions are always there (such as when being forced to slow build something not easily whippable, or just banking fail gold in a wonder, where the whip itself isn't much help unless you abuse overflow), but personally, I hate workshops for most of the game until they become godly with State Property.