The IPv4 address space is depleted, so remaining on IPv4 means deploying NAT everywhere, with all the downsides that come with https://en.wikipedia.org/wiki/Network_address_translation#Is...
13 karma · joined June 25, 2021
From a consumer perspective, going with A and trusting the company is by far the safest option.
This is a natural evolution of the format. It's good for the ecosystem. Whatever guarantees were supposedly provided by having developer (poorly) store their own signing keys are better handled by Google's own infrastructure.