Having meters built in would have some sort of practical use but I would never make comparisons with such meters.
They would often give inaccurate readings from one panel/supplier to another and cause a lot of unnecessary returns.
I have a number of meters that I use in testing and if I use the same meter to test all the comparable products I will get a fair comparison test. If you use multiple meters you will get an unfair test. I have three meters hooked into my RV. One for amps input and volts, one for amps used and volts, and one for battery voltage and I get a different reading from all three of them by as much as 5% they were much more accurate the day that I installed them. The only reason I keep them all in use is for my own convenience and also the accuracy of what I am measuring is not that important.. The masses may use included meters to determine faulty equipment unnecessarily so as a supplier I think it would be a bad idea.
As far as a battery pack goes, the 4 dots are all you need, I have one that shows % of charge left and I find it to be less accurate because it is always dead around 20% also it takes 4 times longer to charge from 80-100% than it does from 0-20%