Tell me all about that. Just when I had thought a brand new Honor 5X was never going to see daylight again then finally it got updated and now is better than ever.Probably, the best compromise between security/updating OS is to use a stock/OEM based custom rom or only a custom kernel but always keeping the root off (some roms can do that). Of course is still 3rd party and not certified OS at the point
And yes, no stock based roms, are usually slower and bugged :3
I didn't root or mod the new phone as it works nicely.
Of course, this require a bit of knowledge, you risk to brick and kill your phone if you do mess.
It had a horrible Core bug that used all four cores all the time instead of one at idle and that was a battery drainer for sure.
Simple enough to drill down into it and make a change but every reset it restored the default along with that bug.
Man I was so thrilled for the new update which included the fix for that issue.