system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I should be allowed to uninstall Facebook and Sony Xperia Movie Maker from my phone.

When I try to uninstall these apps, my phone tells me "system apps cannot be uninstalled". However, why are these apps even "system apps" anyway?

I don't have a Facebook account, and a phone (yes, even android smartphones) can operate without ever using Facebook. Sony Xperia Movie Maker is worse than useless - it makes movies automatically out of your photos and videos, using up extra memory to do so, and the movies you can deliberately make with that app can't be made long enough to be useful.

I really want to make room on my phone for more apps - I barely have enough room for picture-taking because the apps necessary for my work take up most of the space not already taken up by "system apps".

Finally, please don't just tell me to "*just get a new phone*". I try to minimise my materialism. Besides, even if I get a new phone, many phone models have Facebook and other non-essential apps designated as "system apps", making them impossible to uninstall.
gpt
You can. Root your phone and take the apps you dont want off. You're purchasing a product, part of the price is Apple or Android selling essentially "ad space" on your phone. 
If you dont like what they're selling, stop buying it. Money is the only language that corporations speak.