That definitely makes it accessible to newcomers. But costs are going to gatekeep smaller communities from hosting relays as the network scales. There are plenty of obscure conversations happening on the far corners of the network that don’t concern the majority, requiring a full network mirror of this activity just increases cost for minimal perceived benefit.
There does need to be some level of seeding, I think the big push for getting starter packs and the like into Mastodon is an example of that need. At the same time, it’s hard to justify spending the money on extra storage and computer just so I can see posts on furry bluesky or some other niche but highly active community.
It could start using DNS over HTTPS if it had enough failed requests. Those wouldn’t be able to be redirected