Supcom was geared more to turtling because of t1 massfabs and mexes put out more, when far came out they changed those too for less turtling.
You forget reclaim to build game enders.
Watch a replay of the old scathis, they get built, move into range and then die. It's a near completely useless unit. It would be better to move into t3 arty range and build a base and then t3 arty rather build a short range scathis