I had the Xperia X, XA2 and 10 III ever since Sailfish OS became available as my daily driver. That was in 2017.
I am groing old now and sometimes wait up to 48 hours between an update becoming publicly available and updating my single device.
May main usages are Threema, Signal, Mail, Browsing with Fennec, Tor-Browser, and Navigation with Here Wego and OSMand.
I connect my car’s audio via Bluetooth and I use the 3.5mm headphone jack a lot.
I love Hafenschau, Ned Nieuws, Daily Comics and I rely on my phone for everything not involving payments. I have an Idiot-Phone for that.
I had some issues but exept for three days when I had to use my Idiot-Phone as AP in Austria I had no severe problems in most of Europe.
Restarting the phone after crossing borders is quite commonly necessary. Restarting network, audio or fingerprint is not.uncommon but all in all there is no reason to avoid updates.
My car is 20 years old and I will keep it as long as possible, I had a 48 years old motorcycle which I changed for a 13 years old after an accident and some of my bicycles are from the 1960’s. But I was and I am happy with most of the software updates I did until now.
Just do it. After all there are backups.