slight off topic: I have quite a few low end Android phone bought between 2013-2017, only 1 of them is still bootable, all others cannot pass recovery like auth

slight off topic: I have quite a few low end Android phone bought between 2013-2017, only 1 of them is still bootable, all others cannot pass recovery like author’s tablet. Is it something related with older Android versions or just the cheap flash they used in if?