> a "Google Lens" type augmented-reality translation on the fly of great-great-grandma Edith's old love letters.

Actually, your failover system makes me feel anxious inside.

What if this proprietary tech gone missing or disappeared completely?

What if this proprietary tech gone rogue and just refused to cooperate and render the service for end users for any given reason?

I just can't trust one single vendor or corporation with such a critical part of our life but your main point remains salient though.