[qwert12345887]

My guess is just beliefs. It's pretty similar to what happens in code at-least where i work at.

Dev tries to make it super flexible, tries to make it fancy, implement DRY like one's life is dependent on it ultimately resulting in a hard to read/maintain messed up spaghetti code.

Also i don't see how can a person know all of the security stuff with a beast like Android unless they spent/are willing to spend an insane amount of time on keeping up latest exploits, architecture etc.

Sometimes choices are not a good thing.