Why does iOS takes up so much storage space?

I also have this issue. I’ve tried offloading apps and a few online suggestions on how to clear cache but the issue hasn’t gone away. I’ve also restarted my phone and cleared browser history. I’ve deleted all streaming apps. I’m not sure what else to do

IOS Size is determined by apple. other things like Caches are responsible for using up a lot of the storage space on your iPhone. Some of the biggest culprits are the caches associated with streaming and social media apps. These apps cache large quantities of photos, audio, and video so they display faster and playback doesn't buffer in ordinary use. iOS size cannot be reduced, whereas caches can be deleted-clear safari cache, YouTube, etc.