Uber doesn't want your feedback because they care about your ideas/opinions. They want it because it's critical to their business.
Put yourself in their shoes. They have 75 million users and 3 million drivers. A critical part of growth is retention: not bleeding the existing user base you have, by offering a quality service.
So how do they identify undesirable drivers to maintain the safety and quality of their service? And in a scalable way...
You ask users to give drivers a review out of 5 stars. Chances are, if multiple people give a driver 1 star, others will too. It's a pretty good proxy for driver quality.
I can definitely see how this feels "dehumanizing" and like you're a "cog in the system". You are a cog in the system. You're a cog in their automated system for keeping their service safe and high quality.
There are different kinds of user feedback, for different reasons. One kind is user interviews, where you want to hear people's ideas and opinions for how you can do better. This is pretty human. Reviews are pretty automated, and just a different kind of "feedback".
If you run a consumer company (as opposed to B2B), it isn't practical to conduct user interviews on even 1% of your entire user base. So it isn't surprising that giving feedback to consumer companies tends to be a pretty negative experience.
[1] https://canny.io