Sadly yes, that is a hard limitation on most XR platforms. There is a lot of division on whether this is a good thing or not within the industry. Meta kinda started the trend and there is merit to the argument, everyone else followed suit We'll see if things change under market pressure. Apple has already swayed a little allowing access for business XR applications but not consumer applications (e.g. not for apps on the AppStore).
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Understood. There's definitely merit to it and I imagine from a regulation standpoint, these HMD's are probably treated differently to traditional handheld mobile devices. With this in mind the restrictive stance makes sense until the public warms up to the tech and regulations are in place. It will be interesting to see if Meta and other XR platforms follow suit with the enterprise API.
This will be interesting! Passthrough API Overview | Meta Horizon OS Developers