John Carmack has the authority and position to actually make changes to the product. In what company beyond the 30+ person range does a random employee have any

John Carmack has the authority and position to actually make changes to the product. In what company beyond the 30+ person range does a random employee have any ability to just go up and suggest changes to a product and have a reasonable expectation to see the change happen? Maybe their reason for not using the product is the lack of some feature that doesn't even make sense for the company to ever implement. Are the employees supposed to suffer forever in their personal lives because of who their employer is?