Others have mentioned that the server doesn't care about the client side, a client/device is a client/device.
Graphics don't always make the game, gameplay will trump them almost every time. Look at recent games, like Elden Ring. The graphics have been compared to games much older and yet it's one of the top selling titles out there.
This also doesn't touch on the potential claims of a higher level of graphics fidelity giving some kind of advantage (higher draw distance, better ability to ID a ship at distance, etc).
To me, one of SoT's draws is how the playing field is equal for all players. I would vote to leave it alone, it's fine as is.