In some scenarios the iPhone will ask you (which is good) whether you want to share the photo as is or convert it to jpeg like yesterday when I tried to send a photo on telegram as a file to avoid the unwanted recompression
Agreed but in my opinion only what's essential should be pre-installed everything else should be optional to install and definitely can be uninstalled easily.
I believe even the essential apps should be uninstallable (the messaging app, the dialer, the browser, etc...)
I highly doubt it unless there is constant pressure put on them to do so because Knox at this point has been set in stone, only a niche minority still discusses it (us) and talk about it
It is worth mentioning that google does allow for re locking the bootloader on their Pixel line up on custom ROMs and unlike Samsung they did not put a fuse in the Pixels that explodes to permanently disable the device's TEE and its security hardware
Checking whether the bootloader is locked or not, checking for abnormal system properties like whether the ROM is using release keys or test keys, and other methods that idk of, you can test momo which is an app that checks the environment and tells you if there is anything abnormal about it, some use it to check if they were successful at hiding root and anything abnormal
To all of mentioned above from the bottom of my heart