Sounds like a good match for sensor nodes where energy harvesting may be slow and consumption is intermittent. You don't need massive energy capacity, but you need good power density to support transmit bursts, and you need very high cycle durability.

What's wrong with C0G?

They are not even the same kind of component.

If you try to make an integrator out of this thing, you'll have a very bad time.

Very low dielectric constant, so low capacitance for a given size[1].

It also seema these devices are more 2D than 3D so surface area matters more than volume[2].

[1]: https://blog.knowlescapacitors.com/blog/capacitor-fundamenta...

[2]: https://pubs.acs.org/doi/10.1021/acsomega.2c07549