it also doesn't provide stuff like isOnline() (you had to have a Server reference to get an OfflinePlayer anyway, just ask the Server if the player is online ...) and getPlayer().
to obtain an OfflinePlayer instance you had to have a server instance to start with, which means getServer() is pointless, and also that isOp() and setOp() (which can be removed thanks to the fact that OfflinePlayer is not a Permissible) can be done by just asking the server.
these methods have better pathways through Server directly.
Also, setBanned() does not allow customising the reason for banning or the duration, nor does isBanned() account for IP bans because the code is so old ... better to force dependence on a central code path to avoid these inconsistencies.
I want to do the same thing for OP, but that's a separate problem due to its effects on the permission system.
in pretty much every case, these usages really wanted to read the tag's contents anyway, which can be combined with a getTag() and instanceof call for more concise and static analysis friendly code.
In the few cases where the tag contents wasn't needed, it still wanted to check the type, which, again, can be done in a more static analysis friendly way by just using getTag() and instanceof.
