The Flutter engine API has no platform specific dependencies, has a stable ABI and is available in its entirety in a single C header file [1]. It's ideal for embedding.
[1] https://github.com/flutter/engine/blob/080fbcb1759e5916f0d6c...
[1] https://github.com/flutter/engine/blob/080fbcb1759e5916f0d6c...
I'm an entrepreneur with 6 guys working for me. 4 of them write embedded software, 1 uses Qt. I pay for Qt because cost/value is right. I don't develop any more software than I have to. I get a product, I can buy consulting with reasonable price.
Currently, you're exactly right. Google is using Flutter for some of their embedded products, but it's going to be a long time before it's anywhere near as plug-and-play as Qt for the average developer.
The future of Flutter is looking quite promising, though. It's worth keeping an eye on.
Aren't this paid for by the customer which might be priced into the product or for your consulting services?