I tried to simplify and/or paraphrase pertinent information in Bob Blacks pamphlet (perhaps doing it a disservice).
http://sfbay-anarchists.org/wp-content/uploads/2013/01/Bob-Black-Debunking-Democracy.pdf
A simpler response to your comment would be that it's simply not that simple..... Individuals within popular or populist movements approach them, each with their own set of of undeclared assumptions, with ill-defined words and phrases scattered throughout. These can tend to lead people astray from their own principles anarchist goals and desires. So it's probably better just to directly quote Black
"[T]he major objections to
representative democracy also apply to direct democracy,
even if the latter is regarded as an, ideal form of pure
majoritarian democracy.
[S]chemes for direct democracy typically call for a federal
system with layers of "mandated and revocable delegates,
responsible to the base" by which the decisions of assemblies
are reconciled. Some delegates to the higher levels will
potentially speak for a different number of citizens than
other delegates but cast equal votes. In a federal system of
units of unequal population, voting equality for the units
means voting inequality for individuals. The federalist
- but single-member - simple-plurality system evidently
contemplated by most direct democrats, including
the syndicalists, is the least proportionate of all voting
systemsY
'Ihe inequality will be compounded at every higher level.
The majority; the majority of the majority; the majority of
the majority of the majority - the higher up you go, the
greater the inequality."