Lessons learned:
1) I can't successfully use skirmishing tactics against a Sumo without a substantial range advantage.
2) When placing power lines, be careful not to accidentally wall off friendly factories or plates. It's worth incorporating a couple of solar collectors into an efficient wind grid just to leave larger "doors" for friendly units to path through.
3) On the other hand, once the factory is blocked off, the best solution might be to simply drop a plate on the other side of the obstruction to build large units with.
4) Even though I was routinely scouting the middle of the map with Moderator sweeps, I failed to notice that the other team was vulnerable to a bunch of Pyros taking the shortest route into their base. While spotting high value targets is valuable scouting info, so is spotting a complete lack of targets!
5) On cliffy maps, a disposable high ground radar can be worth it just for a single clash even if it's cleaned up afterwards.
6) I need to practice jumping as part of routine movement! My units' jumps were almost exclusively used for fighting or pre-fight positioning, even though they're available as soon as the unit walks out of the factory.
7) A Jack Surprise or similar bypass tactic works best the first time. Produce enough Jacks to do it once per front, then wait for it to leave the opponents' minds before making more.
8) Even on land-focused maps with water around the edge, it's necessary to have some sea control during the endgame to deal with sea striders.

Would like a second opinion on:
1) For early Moderators, whether to group them all into an unapproachable ball, or split them up to use their slow damage to help other damage dealers deal real damage.
2) How to defeat an isolated Sumo, in general.

I feel like this guy with become purple at this rate.