Uh huh, sure.
So if you think the way voting is treated it causes people to check out, my arguments still stand.
You have no proof of that.
That study clearly didn't state the same thing you did.
Voting can actually get people more engaged with organizing than less.
Oh wait here's a bonus, no one treats voting as the only means of engagement, much less the primary one. People talk about calling and writing to their reps, running for office, filing out positions, etc.
Watch we'll get into a semantic debate about what you mean by "primary" next. Either as "the only way" or "the main way", both of which can be argued against pretty easily.