I think the Beacons do more lag than any other block and i think u should ban beacons and bring hoppers because i don't understand how a hopper causes lag because all it does is take in items.
Good suggestion, if disabling beacons will bring hoppers back then i Vote for Disabling Beacons for Hoppers to come back even with limited amount for each one like 20 because hoppers are more useful.
Beacon tends to lag server ... Hopper on the other hand does lag the server but its not as lag as the beacon (unless u are making a auto sorting machine)