Instead of justifying your stance and reluctance to use all of my tips, why don’t you just try them, before dismissing them.
My wife and I use older iPads older than yours.
We use both 6 and 7-year old iPad 2 and 3 models.
With all of my tips those iPad run fine.
Your iPad Air 2 is 2-3 years, newer and more powerful than any older iPad models!
My tips WILL help your iPad Air 2!
A lot better than you think.
Also, FYI
Running a beta version of iOS is always risky, and not really advisable to run as these are unfinished and unrefined versions of the eventual final release of an iOS version.
For starters, turning ON reduce motion minimises all of the necessary iOS UI graphics eye candy and you will see an uptick in performance just doing THAT!
Turning OFF Background App Refresh is another biggie!
So is minimising and editing which apps get notifications.
You do not need every single app on your iPad getting notifications and reminders.
Your iPad Air 2 WILL run much better doing these things.
I own a 3-year old iPad Pro. Your iPad Air 2 is only one year older than mine.
Even on my iPad Pro, I run ALL of these optimisation tips and I am sure my iPad Pro is performing the best and fastest it is able.
Just try them all, please.