This is the global forum so please use English (used google translate for this)
And as for your question Asus hasn't vouched for 3 os upgrades yet their update plan still is "2 os versions and 2.5-3 yrs of security patches"
Considering many OEMs promise 3 os versions now Asus should consider the same though but that remains to be announced as of now
LOL... That's good one. I got a Zenfone 5 with Android 8, there was 9 but that was it, no official 10.
That's the problem with buying Asus phones. You'll be lucky to get more than 1 OS upgrade.
Zenfone 6 gets 2 OS upgrades.
Hm this ain't the case with flagship Zenfones tho your Zenfone 5 was a midranger (snapdragon 636) I know that's no reason to not give two os versions but many OEMs generally give 1 os upgrade to their mid range phones for example the phones launched alongside Zenfone 5 in 2018 like redmi note 5 pro and honor play never got android 10 and are still stuck on pie
Your Zenfone 5 has a A10 beta tho right?based on aosp?
Zenfone 5z got two os upgrades too
Android Oreo (launch os) to Pie to A10 (they're still pushing fota bimonthly to 5z)