I can’t speak to Stukov compared to Stetmann because I wasn’t playing when Stukov was first released. Obviously Stukov has the ability the cause lag, but even with my mediocre-at-best computer, I don’t automatically experience lag issues just from Stukov being my ally. With Stetmann, however, I experience lag consistently, all game long, any time he is my ally. It has been noticeably improved upon with all the recent changes, so I’m happy about that, but it’s still not completely resolved (my guess is that it has something to do with the Stetellites and the auras). Stukov, however, has been pretty much lag free in my experience, until late game on some maps where he has 25+ bunkers.
Anyway. I’m happy Blizzard did their job in a timely manner and quickly addressed the Stetmann issues, making some good, sensible changes in the process. I hope they continue to look at Stetmann and try to resolve or improve his remaining lag-causing issues.