lol calm down
sacu presets are technically different units - no ambiguity here (edit: they have different icons, costs, names, codes ect ect)
That is why they don't all get selected on double click
But, yes, you can argue that all sacus are sacus and maybe they SHOULD be all selected by double click
you can also argue against that by giving an example that you would not want to double click your rambos and accidentally send RAS sacus to fight experimentals.
pretty much the same with HQ and support factories... anyway would be cool to have an option to be able to get similar units selected by double click, but we don't have that option. And it was never planned cause people never complained about that before.
Maybe making a UI mod would be possible
Edit: if i could set that if i double clicl ASF or interceptor and all faction ASF or inteceptors get selected i would probably never learned select all fighters hotkey xD