Maybe if more people thought this, a lot less posts would be made. I'm guessing that would be a net positive for society in general.

The size of an ActivityPub payload overhead is minimal.

On each individual server they are ideally saved based on their unique identifier (which are RFC3987 IRIs) and I doubt that there is any software that will do it individually for each inbox instead of storing one copy to which each inbox links to.

To minimize even this, each server can store just the IRI(which is mandated to be de-referenceable) and load the payload when prompted by UI. I doubt that anyone does this also.

If. Did you research if this was true before posting a knee jerk reaction to something that might not be true? If not, you are no better than the person that posted the misleading comment.

Remember there's a fair bit of speculation here, I just thoughtlessly blasted my question here without researching (not sure where to start, tbh) and UncleEntity didn't seem too sure about the duplicated/redundant requests. It's entirely possible that Mastodon doesn't have this problem