Deadulus should have support for the Trezor One. I notice on https://adalite.io/ that only Trezor T is supported.
This Hardware Ledger is far more expensive than its predecessor. Most people who already have the original Trezor are not likely to buy the new Trezor T.
In order to be more inclusive it would be prudent to have Trezor 1 support. The original Trezor cost less than the current Model T which means average people will buy it vs the T.
There are likely benefits to owning a T vs a 1 do most people do not care. They just want to get in get out while saving a few bucks. With the current state of the planet people find themselves with less capital.
Some people might not feel safe using the Deadulus wallet without some kind of hardware ledger support.
This could be problematic when it comes to the rate at which adoption takes place . A for effort for Vacuumlabs do a litewallet on a companies computer server is not particularly appealing to someone who would like to safeguard thousands if not millions of ADA.