I think it's more interesting on an openttd server, because you're competing against other players, so the graphs inform you about their actions and how well you're keeping up with their economy.
AFAIK many OpenTTD online games are cooperative with many players building a very complex transport networks, usually with some objective. Like all with steam locomotives, bus network with transshipping, etc.
It's added as part of the dedicated server, and available for all players on the server. This kind of data is also available in game, but not as detailed.
