At the turn of the year, it seemed that Xiaomi would be bringing Android 10 to all its eligible Android One handsets. The Mi A3, A2 and A2 Lite were all due to receive Android 10 this month, but only one has so far. Worse still, the January update has started hitting the other two, and not as promised.
https://www.notebookcheck.net/The-Xiaomi-Mi-A2-Lite-and-Mi-A3-receive-disappointingly-small-January-update.450920.0.html
Still better than Nokia. Nokia 7 Plus received last security update in November 2019 and nothing else since that. Being an Android One device, there are already two updates missing. Android 10 update hasn't been delivered in Europe yet.
This January security update screws up your wifi settings. Took me 39 minutes to get it fixed
Xiaomi already said that A3 would go 10 on February. Why did you expect it earlier?
My Mi A2 is updated in android 10 Q update and January security updates