iPhone SE 32GB IOS 10.3.3 to 11.2.6 Update: Evaluating Performance and Battery Life

I am a happy owner of an iPhone SE 32GB on IOS 10.3.3. Everything works as it should, nothing is broke, I do not complain about the battery.
From time to time I get a sneaky message "update this iPhone" - the currently proposed version is 11.2.6. Successively and stubbornly I refuse, being fully aware that if I raise IOS to 11.2.6, I can forget about returning to 10.3.3 ...
At the moment, my friends' opinions stop me from updating:
- one person after updating the iPhone SE strongly complains about lag and battery
- one person complains a lot about the iPhone 6 - also the lock and battery

I don't know exactly which version 11 the above-mentioned reviews apply to, we currently have a second major update and a minor update to a second major. It seems to me that the problems of childhood should already be solved in such a high version.

Since I do not really have how to compare, I am asking for help from people sitting on the topic on a daily basis, as in the comparison 10.3.3 vs 11.2.6 the question looks like:
- iPhone SE performance
- battery consumption
- interface tagging
- mistakes and annoying imperfections
- does 11.2.6 bring any "new quality" to 10.3.3 for someone who uses an iPhone to:
1. calling and text messages
2.car navigation (google maps / Yanosik)
3. handling the banking application
4.Safari on the Internet from time to time
5. occasional checking of e-mail
6. youtube
7. listening to the radio
8. occasional taking of photos, sending them by e-mail / mms / via iMessage
9. games in banal and not demanding in terms of GPU performance

All kinds of fairy tales, trinkets, animations, emoticons are something that I consider superfluous and I would like to get rid of them, if only they would have a positive effect on increasing efficiency.

From mobile devices, I require the maximization of battery life, so I do not allow applications to update in the background.

Check if your phone is vulnerable to this attack: https://niebezpiecznik.pl/post/tym-artykulem-zabijesz-komus-iphona-i-maca/

I suppose it is ... What's more: the vulnerability also occurs in version 11.2.6 and it is only to be patched by version 11.3.

On the subject of this vulnerability: no matter if 10.3.3 or 11.2.6 - the problem still exists.

Well wait until you patch it and then update to the newest one.

The problem is that I am not convinced IT IS WORTH UPDATING AT ALL and that was what this topic was supposed to help to clarify this issue ...

My point is that I have a device in which everything works as it should, so I wonder if it is worth the risk of making potential problems ... Is there any measurable added value that would be worth the risk? Will the system work faster / slower, will the battery last longer / shorter, or is there a "new quality"?

I have an iPhone updated to this version.
- Performance
I did not notice any big changes, except that the phone can sometimes be thrown out of the application and then there is a small charging circle on a black background (as in this video sent earlier) and only resetting the phone gives something, because otherwise it loads endlessly
-Battery consumption
it is slightly larger, but rather imperceptible
- lagging
Here I will add that the keyboard has started to fail for me recently - it is often impossible to write anything on it for about 5 seconds. Really annoying when you want to do something quickly
- Bugs and imperfections
Besides, I didn't notice anything above. I am just prejudiced against iPhones so it would only be my pains

And that's what I meant ... So there are annoying flaws in this version; P

Hereby the answer is clear: I stay at 10.3.3! Version 11.2.6 is not worth switching to.