It's not as if most companies- or at least most startups- are particularly good about preventing individuals or individual teams from becoming vital cogs, leading to tribal knowledge. Unions won't lead to less documentation that the existing poor organizational cultures already foster.
My question was about whether unionization constitutes an increased incentive (and I would think that it would for the same reasons that unionization gives a collection of individuals more power than they would have as individuals); I don't think that depends on whether or not existing institutions are good or bad at preventing vital cogs, etc.
I might be wrong, but I don't think it's because of the efficacy of existing institutions.
