1- The block used to power it wouldnt last forever, so the iron you used to activate it would last xx amount of time, each ore/ingot would last a certain amount of time based off which ore it was with Emerald lasting the longest.
2 - Range of the Beacons would vary depending on which blocks where in the pyramid, Iron having the shortest range and Emerald having the biggest range with the others all in between.
These 2 changes would really help flesh out the beacon from a technical standpoint.
Why would emeralds be better than diamonds? They are easier to get.
Why would emeralds be better than diamonds? They are easier to get.