Voting is a placebo, but every election is stolen before it’s even held. Party members decide who gets to run in the primaries and draw the congressional districts to ensure no third parties could ever hope to win. Actual competition between the parties is limited to battleground states, electors elsewhere have no influence on the outcome.
So, you’re right, but not in the way you think. The political establishment pushes an illusion of choice to keep the population from exercising its power.