A few corrections!
Re your aghastness, don't panic. We created this using Checkvist, a multiuser collaborative environment, just as you suggest. In fact, we stated that right next to the mention of BBedit (which we used to massage the final content into template).
As for not covering Roman cafe stuff, we note frequently in the app (e.g. the FAQ) that we mostly focus on cuisines as found outside the homeland, i.e. in immigrant restaurants. The end result, we've found (editors and testers having tried this out while traveling in over a dozen different countries) is nonetheless very useful in the original country. So we affirm that it's useful for both.
But it's not thorough. We never claim that. This isn't an encyclopedia, as we make quite clear in all marketing materials and in the app itself (including a huge honking pop-up message at first launch). This is a cheat sheet for experts, and a lifeline for newcomers.
It's definitely directed at both. I'm a pretty experienced eater (been covering the world cuisine beat for 30 years), and I use the app all the time. I can't keep all these details in my head. This is the cheat sheet I always dreamed of.
As for inaccuracy, well, let's see what experts have to say! So far I've only heard delight. I can't use his name, because he hasn't approved public use of this blurb, but my favorite food writer (many food writers' favorite food writers) sent me this today: "I’m in awe. Fantastic, highly useful, surprisingly entertaining, and highly addictive. I hope it flies."