Ubiquity could build their app and hardware to support putting the card into Wallet, they just haven't. It's been asked for many times on their support forums, but so far no commitment to do it (it's apparently difficult because Apple requires a higher level of security for the authentication than what Ubiquity has build so far). HID (one of the largest access control vendors) has done that, so employees at companies that use their system can add their badge to wallet to just wave the phone at the reader to unlock.
I find it particularly annoying because it takes 2-3 seconds before the reader detects my phone. vs the instant that a proximity card usually takes.
These days i've resorted to having the physical card in a slot on my phone case's wallet cover.