From our investigations AmneziaWG is strictly worse than Obscura’s QUIC-based protocol w/re obfuscation.
VPN turning off on designated trusted WiFi is tricky, because Apple APIs only allow matching based on SSID name (e.g. “Carl’s Home WiFi”), which can be easily spoofed. (Link to Apple API) We may allow this with a warning to users though!
It’s interesting how many people are asking for iOS shortcuts, we’ll look into it!