It makes perfect sense considering the vast majority of touchscreen devices are locked down. Also a hint: if you ever thought that the ability for "sideloading" means that a device is not locked down, you have fallen victim to PR-speak even though that very word is an indicator of how they see that ability: something not normal, but something that happens from the side. This sort of speech, changing the normal "installing" to mean something controlled by the vendor of your OS and renaming the previous "installing" to "sideloading" (which is optional and this sort of ability to disable it is condoned by the OS maker) is affecting the way people even think about these devices.