I've gained a newfound respect for tool development lately.
I've done game development in a capacity or another for a while, but tool development is a new thing to me. At work recently (I mean for the last year and a half) I've lead a development effort for an in-house visual scripting Unity plugin (shameless plug: it's for this game). And I would never have thought it would be that long to make... It definitely one of those things that looks easy when it's definitely not.. Even for relatively simple things like "changing" a state, or a variable getter/setter; there's always a fair bit of work involved; and often more than anticipated.
tldr: kudos to the Korman team for doing this!