Plex and other servers

I see comments about Plex servers, and was wondering if someone could explain the advantage of a server.
I tried Plex cause I wanted smart menus for my collections. Is the reason Plex can do this is because of their servers. I didn’t try the other servers so I don’t what they offer.
Since infuse doesn’t have a server, does this limit their options?

A post was merged into an existing topic: Why use a server such as Plex or Jelly Fin with Infuse?