How hard it can be to bring gesture navigation... Even 3rd party apps can do that for a long time. It's actually the only way on xperia.
Not to mention navigation on latest flagship is nowhere near non-intrusive, as good as on the likes of xiaomi or with useful gestures for 21:9 screen. Half baked it is.
I just got the new Android 10 on my H8216 XZ2. Btw, I'm in Croatia, EU. It looks good and I have all new gestures working fine.