Looks like a lot ofpeople are confused/annoyed by Mastodon and many other Fediverse platforms not backfilling old posts when an account is followed.
This complete lack of backfilling means that many new accounts or those with few followers may appear completely blank, even if they've posted lots of interesting stuff.
If you agree and think Mastodon should backfill at least some posts when people follow an account, please give this issue a thumbs up:
https://github.com/mastodon/mastodon/issues/34
If you're not comfortable using github, let me know and I can try to post on your behalf.