I really don't see 3-2=1 as being "complex"; and certainly not more so than adding two or three modifies to a dice roll.
I can see arguments against stacking advantage based on the fact that the math might not wind up with the probability curve we'd ideally want; I can't really comprehend arguments that it's in some way complex, though, let alone too complex.
Nah. Stacking them might lead to some odd results, but it doesn't lead to complexity. It leads to counting. Like on Sesame Street.![]()
I agree that it counting isn't complex in general, but could we agree on tedious? I can easily envision a group of players combining a handful of advantages and disadvantages throughout a single combat, as well as opposition forces doing the same. I can also see players digging through rulebooks trying to squeeze out every Advantage and the DM doing the same for Disadvantage and this escalating into an arms race every turn, possibly with some angry comments and what-ifs and why fors and but but buts. I hate when games devolve into that state and that is exactly why I like the A/D system as presented thusfar: it's on or off. Period.