Averan1) ok then, now I know why.
1. "Icon pack support has been removed from the launcher" yes that's true from what I know this was done to avoid some compatibility issues (other OEMs have did the same afaik)
But still there are many icon packs you can apply through their apk (many support Zen ui launcher)
2. Did you try sliding the notification away?left or right? What's the behaviour then? (This might be an isolated software glitch with you)
3. You have to link your Google account to access saved contacts in twin apps settings for the cloned app
And please don't don't disrespect the devs even if there are some bugs, you may not agree but Asus did work pretty hard on Zenfone 6's beta program this year, it got 14 fricking beta's in total and Zenfone 6 remains one of the only 2019 devices leaving pixels to get updated to android 11.
Plus this time the experience has been very stable for everyone leaving a few cosmetic bugs that's rather good as a jump from one android os version to another brings various bugs with it (just look at the amount of complains on oneplus forums regarding oos 11)
If you find a bug report it to the mods it'll be fixed in the next ota
Asus added almost all Zen ui 7 features to Zenfone 6 icon style,accent color support, animation speed support in ui itself,Rog like game genie, battery care features,a smoother and aesthetically better ui and the removal of bloat like avast
That's all I gotta say