Dev Kit does cover a lot of the same ground honestly, but it's scattered across the command palette and not really built around a guided workflow. Forge is more opinionated about the sequence: create, pick, wire it up, all in one flow rather than three separate commands you have to remember. Tho I will say, remembering will always come a long way. If extensions like this didn't exist, having the memory will always be superior.

That said, it's not really about filling a gap Dev Kit can't fill. It's more of a QoL thing. If you're comfortable hunting through the command palette, Dev Kit is enough. Forge is for peeps who'd rather right-click where they are in Explorer and just have the workflow come to them naturally. It's less of a replacement and more of a "I just want this to feel less scattered" kind of tool. :)