As long as you have term limits, you don’t have to move states/countries to get different leaders, you vote.
My choice to go with this provider or that one has 100% of an impact on me. There is no creative destruction going on with the USPS.
Voting is the most minimal way to participate democratically. Much more meaningful are advocating for your needs to elected representatives, speaking out publicly, and organizing/attending demonstrations.
But if you want to give up democracy to live under a dictatorship, certainly don't pretend that you actually speak for anyone other than yourself.
Please don't do the Reddit thing. The argument wasn't "we need dictatorship", it was "it's easier to switch commercial providers than governments if you're unhappy".
This is because they have a government protected monopoly. Cities like Chicago and Baltimore and NYC used to have dozens of competing utilities before the government began granting charters that gave one firm an exclusive right to provide power, gas, or oil.