There can be an interrogation endpoint/message of supported versions/extensions to the base protocol, that's a very normal thing. If it supports bundled delivery, send a single bundle if not send them all individually.
Yep, And I'm sure there are some instances that do exactly that. But in a distributed protocol you only get the benefit if both sides of a given interaction support the optimization. For something in the spec that is optional you can't rely on it and you aren't forced to implement it so it's not irrational to just ignore it. Which typically means you only get occasional marginal benefit.
i mean it depends. The vast majority of fedi traffic is mastodon. Add it to mastodon it makes an impression and a real difference. At first mastodon to mastodon comms, but others will take notice, it will find it's way into libraries then it's smooth sailing.
