Firbolgs are a weird race that I’ve always found vexing. Every time I read about them, I find something odd and confusing in their lore. For example: prior to 5th edition, firbolgs were basically tall, viking-esque giant-kin with enormous noses. No blue skin and red noses. In fact, as far as I know there is no text describing the the Firbolg’s appearance which matches the art in Volo’s Guide to Monsters, and Mordenkainen’s Monsters of the Multiverse not only didn’t provide more descriptive text, they reused the art. Regardless, I do think the blue skin and pink noses are novel and I like the new appearance a lot. It would be nice if we got more art of firbolgs.
Lore and cosmetic frustrations aside, the updated version of the Firbolg is a serious improvement. While their innate spellcasting no longer recharges on a short rest, the new standard for innate spellcasting makes it easier to use on whatever class you select, and you can always recast the innate spells with spell slots. Hidden Step also works PB/long rest now, allowing you to use it bursts when you really need it rather than hoping that one round of invisibility is somehow long enough to do the trick.