here's a fictional anecdote to demonstrate a good teamwork:
i am player A with lane partner player B. we are against C and D. let's ignore other 4 players for now.
case 1: player A try hards, player C is forced to hold back workers and cannot send big mercs to my homie player B. now B can auto send and push workers with gay abandon, while i cover his ass. But as a result, player D gets plenty of income sends and bonus gold, no real threat. D has two choices, push workers to maximize economy competing with C. or try hard and make A leak so B is forced to hold back on workers.
this is one case where A chose try hard. 1 more case where A can choose auto send. auto or try hard? 2 decisions per player.
for all 8 players, that's 2^8 = 256 possible outcomes. try-hard may also have variations due to income sends occasionally but let's ignore that
each outcome works through 4+4=8 layers of complexity (counter approach of 4 players on half map and 4 more for other half) which is a function of cognitive ability of each player. 8 people choose one of those 256 outcomes and form their decision-making process (may change later, but let's ignore that for simplicity). that's 256-P-8 variations of a game, which is a pretty fucktonne of a big number of order 10^19
summary -
auto-send, no variation, no decision. only 1 way to play. pray you get a good roll.
try-hard, lot of variations. bad rolls? no problem, try to break the other guy's good roll.
footnote: i suck at math