When the thing is a Firbolg, you’re not only observing a character; you’re witnessing a bit of the natural world stepping forward to interact with the broader world. Battle smith turns you into a more martial class by supplying you with martial weapon proficiencies. This is the kicker

With the ability to shrug off damage is a good reward, as is getting a free Athletics proficiency. You’ll endure a tiny bit later on from not getting Darkvision, but your Positive aspects significantly outweigh any downside! *Bear in mind that the custom origins rules in Tasha’s Cauld