This table is old. Patches are coming within days after release. I know that, because I have two phones to test all those roms. On IodeOS I got the first beta some days ago for the next march update. They are not slow. They are as secure as vanilla Android from Google. GOS is the paranoid on. Perfect for paranoid people like the developers themself. Only exception is /e/OS. It still is very slow to releas patches or even new Android version.