No shit. It was very clearly a device to test the waters (and for consumers to show off for Apple in the media). And even if you're all-in on Apple's ecosystem:
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No one is going to seriously use these in public (apart from for all the social media videos; it already happened)
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It has an external battery pack that just hangs
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It's $3,500, and cannot function entirely on its own (realistically, regardless of what Apple claims)
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At least in earlier iterations, the lens glass has been prone to crack
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It's bulky for what it is
You can argue it's "ahead of its time", but we already have had VR and AR glasses that more or less accomplish the same core things. I'm not saying Apple's isn't better, but not for that price.
The main function is, "it's a giant virtual screen" ["for your other devices"], right? I recognize it has its own OS and all that, but Apple always shows it acting as like a monitor for your MacBook Pro or whatever. Boom: $400, and from a known brand in the space:

For $3,500, you can buy a Mac Mini, a MacBook Air/Pro, and iPhone 16 Pro, and still have money left over.