That's not it. The concept is "if you choose to install this particular OS on the device you own, then it comes with this particular security model". That's totally fine. If you own your device, you can run Linux on it and you'll have root access.
"Not owning your device" means "not being able to install the OS you want on it". I want to own my device, obviously. But it does not mean that I own the developers of every OS in the world and that they should do whatever I tell them to do, for free.
If we want to use banking app we have to use a non-rooted/leased device. That is what is really messed up. Personally I only use bank now that has website for banking. If they don't have a web site only app, then it is a red alert for the company.
It's what makes computers so wonderful and powerful, you can just have it do whatever you want. Turning that into "whatever google decides i should be allowed to do" is not gonna lead us to a bright future.
The answer to every security issue not "add a backdoor".
Problem is, I strongly suspect we'd still be having the same discussion even if we were talking about "allow the user direct access to all files*" instead of "allow the user full root rights".
Because while some of those missing capabilities are "simply" a matter of it being too much effort to provide a dedicated capability for each and every niche use case (though that once again raises the question as to whether you prefer failing open, i.e. provide root as an ultimate fallback solution, or fail closed), with file access I guess that this was very much an intentional design decision.
There's just too much hacking going on, malicious behaviour, to allow uneducated masses to have root on a phone. I've seen so many people just not understanding the outcome of their actions. You'd get people rooting because some shady app lied about why, and just wanted control.
And we don't need more botnets. And it's why banks sometimes throw a fit.
So if a recompile does the trick, and no downside, then it'd be fine.