I know this is still an unpopular opinion, but airgap in itself does not really add to security. On the contrary: more secure protection protocols (like "anti-klepto") are so complicated on airgap wallets, that they are simply ignored and downplayed. In this sense, "airgap" is mostly a marketing term, without much substanse. We wrote an extensive blog post (fact-based, with sources) on this for further reading: https://blog.bitbox.swiss/en/does-airgap-make-bitcoin-hardware-wallets-more-secure/

For easy integration into 3rd-party wallets, however, "airgap" communication like QR codes, PSBTs via microSD cards or NFC is great. We currently don't have any plans for this with the current BitBox02, however. Although the microSD card would be a natural fit to "load" a PSBT, we fear that users would mix up their backup mSD card and put it into an online device.

I'm curious to hear more about the motivation behind the question: security, wallet integration, or something else?

As @Stadicus already answered on the security aspects, I would like to add that I feel like air gapping adds unnecessary friction to self custody.

Passing back and forth microSD cards or even scanning QR codes, charging batteries and focusing most of the user experience on a low performance, hard to use device makes self custody tougher to use for the average person, in my opinion.

/Joko