Newer ROMs offer better permission management. Top Custom ROMs for Samsung Galaxy Tab 3 (SM-T211)
A custom ROM is a third-party operating system built from the source code of Android (AOSP). Manufacturers stop updating devices after 2-3 years, but the open-source community keeps them alive for a decade.
This is the main reason to flash a ROM today. On stock Android 4.4, modern apps (Chrome, WhatsApp, modern games) no longer support the OS.
Unmatched customization options directly built into the settings menu.