To be honest, I find the new interface really unintuitive and irritating to use. Many controls are hidden and the way stacking and adding/removing upgrades works is, to me, extremely irritating and requires a lot of unnecessary clicking.
In the current builder, if I have a stack of, let's say, 4 units of Stormtroopers with DLT and I want to add an astromech to one of them, I simply click the personnel icon and add the astromech, which adds one copy and creates a new stack. If I remove the astro, the unit gets added back to the old stack automatically.
In 2.0, clicking the personnel icon adds an astromech to every unit in the stack, so I have to either duplicate the stack, add the astro and adjust the number of units in each stack, or add another unit of Stormtroopers that will not stack with the other ones and adjust the size of the other stack.
Also, the controls on mobile are really cramped and I often accidentally resize or duplicate a stack when trying to add upgrades.
I love your work, but I would really prefer to stick with the 1.0 way of doing things, especially on mobile.