The thing with making it so it's one banner per unit, rather than 1 per 10 (or whatever the minimum size is), that you won't be able to split up sizes of units and you'll have to buy extra boxes of troops to get a single extra model so you can do this.
Meaning for example 20 plaguebearers only having one standard bearer, means if you then change it to 2 units of 10, that you would need an extra standard bearer. Meaning you would need to buy an entire new box for one extra troop to fill out your unit.
Tbh I would quit if they did this. Not paying that much money and wasting stuff.