Semi off-topic, but I love the web/app-based hotel selection process as the OP had. Lets you choose the hotel from a list, almost as if you're browsing hotels.com or the like within the United app/website.

Meal vouchers were a little difficult and cumbersome. Had to literally hand my phone to the waiter at the B22-ish Italian restaurant at ORD, where he disappeared with it for 5 mins as he manually entered the card info behind the scenes. I wasn't super worried about anything in particular, just the normal feelings I'd have if I handed any stranger my unlocked and opened phone, out of sight, for a few minutes. There's got to be a better way for that part of it.

Since that experience, I've also had manual food vouchers as well (different trip, different canceled flight) and still maintain a strong preference for those over the app-based vouchers because of the redeeming process at a sit-down restaurant.