Hi all, I’m an interface designer working at Tlon, the primary company developing Urbit.
I’m happy to answer all and many questions about this system, about my personal hopes and dreams for building computers and an internet that are smaller, more easy to be reasoned about, and where people can grow communities of their own accord, versus dealing with the ‘grain’ of how the advertising-optimized is currently constructed.
I joined post-Curtis, and absolutely do not vibe or align myself with his political output, past or present — there are a good cohort of coworkers/peers who occupy a similar position as myself! I think we could be broadly categorized as more anarchist in bent, if you had to place us in a box 
I think the primary point of critique that’s generally top of people’s minds who find urbit unpalatable is the self-imposted limitation of 4billion “short-named” nodes in the system, which are meant to represent human-sized entities (from the individual, to the family, to the school, to the small business, etc.). It’s understandable that building a system with a limit of 4billion -short- named nodes is worrying, but similarly to how all 7 billion humans don’t each own cars, and travel in buses or planes or what have you, urbit nodes can be shared between small groups of friends, or families or such.
The other addressing of this concern is the plain fact that other ‘long-name’ nodes exist in the system, and number in the several hundred quintillion or so! Far more than the amount of people who will exist, very likely lol. You can think of these nodes as individual accounts as defined in any other p2p system, as a hash, but with a naming system overlaid across it. This is a case perfectly outlined by secure scuttlebutt (ssb), bittorrent, hypercore/dat, and really most p2p software out there.
I’m personally excited about urbit because it is a promise of a fresh start for how people can interact with computers. A lot of people’s misgivings with it are unfortunately mixed up with the dude who invented the undergirding opcode list and associated programming language, but his work has effectively been written over many times over at this point.
I’m happy to field any questions here about urbit or my involvement in it. I’m obviously here at lines because I love music lol, and i’m excited to bring musical capability to urbit eventually. Monome’s software and hardware are huge inspirations for me, personally.