Not everything is about gamist/simulationist. Being considerate of other people's time isn't a balance issue. WOTC not catering to the type of person who wants to do that isn't some gamist design conspiracy.
t's about one player monopolizing the table time because its generally not fun to sit on your ass while the other guy takes 20 turns to your one, clogs up the battlefield, and slows the game down with tracking 20 different hit point totals. The decker minigame in older Shadowrun editions also sucked because the rest of the party zones out while the decker goes on their little hacking adventure. Its OK to design a system to reduce/eliminate pain points.
And that's just in combat! Outside of combat you basically want a bunch of slaves for unpaid labor. Great, now the DM has to figure out how fast skeletons can weave baskets and how much they sell for or whatever else TFG is having them do every second not actively in combat. Because let's be real, the swarm necromancer is almost always played by TFG. It's almost always about what he can get away with, and just serves to make the game more about him. It can be ok in a 1-2 person game, but when other people are waiting to get to the action and the DM has to spend hours figuring out Necro Bob's skeleton factory income, it sucks the fun out of things.