With the time between restarts, it wouldn't seem like tps would be a problem. However, sometimes, you just want to make sure everything is running fine. I think it would be useful for players to be able to do /tps for a few reasons. If the server is lagging, we'd know what it is and we could check all our machines/pipes/etc to try and see what is causing it. If the server isn't lagging but someone thinks it is, /tps would show them if it is or isn't which would get them to stop complaining, or if it is, to find the source like in the first reason. It'd also be useful to check after setting up a new system to see if we had any effect on the server, and if we did to modify our machines. Lastly, it's just a nice quality of life improvement to know the tps.