They are all cold storage devices, & yes they are bitcoin computers at their core,
Not all of them are airgapped or stateless though,
& none of them are wallets.
Ex cont.
lets say you use one of those other devices, that hold their state, you can throw the device into a fire & your wallet would be unaffected if you have your seed phrase.
If you want to continue using signing device at least youre not using the word "wallet"...even though it only describes a less important action than private key generation.
Alas, if you wanna continue using HWW go for it brah!