That is what we are missing. The Fediverse makes searching by keyword so simply easy, with it being decentralized, this feature will be preserved as long that people developing the Mastodon's and the Lemmy's keep supporting it. If they don't you won't ever actually lose that feature you would likely have to join another platform like Firefish, or Sharkey and search the Fediverse that way if something like this were to happen. This is why I still stand with the Fediverse being better for the longer term than Google as a search engine.