Sam,
For sure you cannot get to a point where TA and pH are fixed numbers and never change..
You can get to the point where the Ph increases more slowly depending on what your TA level is.
In my pool this means running my TA between 40 and 50, which keeps my pH in the 7.4 to 7.7 range.. pH still drifts up, but slowly.. In truth, I tend to automatically add acid twice a week, which tends to keep my pH in the 7.4 to 7.7 range.. I'm really trying to just keep my CSI in the negative range, as when I don't do that, I get calcium scale that my robot picks up.
If you are saying that "balanced" means that things don't change, then I agree, that is total Bull Feather..
To me "balanced" means that you are able to control the amount of change, with routine testing and adjusting..
Thanks,
Jim R.