I've made a comment on this on someone else's post, but it barely received any traction. This is a pressing enough issue in my opinion that I'm posting it again hoping something will be done. Skip to bold text if you don't want to read all the stats
The stats for each faction's static T3 arty are completely unfair:
Cybran T3 arty: 480 dps 69600 mass
Seraphim T3 arty: 500 dps 70800 mass
UEF T3 arty: 550 dps 72000 mass
Aeon T3 arty: 600 dps 73200 mass
Comparing these values using Cybran T3 arty as the base gives:
Cybran T3 arty: 1.0x dps, 1.0x mass
Seraphim T3 arty: 1.042x dps, 1.017x mass
UEF T3 arty: 1.146x dps, 1.035x mass
Aeon T3 arty: 1.25x dps, 1.052x mass
This means, compared to cybran T3 arty:
Seraphim T3 arty is 2.46% more effective for its cost
UEF T3 arty is 10.7% more effective for its cost
Aeon T3 arty is 18,82% more effective for its cost, and this is ignoring Aeon's doubled alpha damage which is preferable for breaking through shielding.
Considering T3 arty is built in the later stages of the game in teamgames, the only thing factional diversity in these matters can result in is making tech sharing a must. It's completely unnecessary, annoying, and unfair.
I propose making each T3 artillery similar. Mass/damage values may differ, but they should scale proportionally.