Technically speaking Base theme should look just as good in it's raw state as Bootstrapbase does.
Sadly that is not the case. So I was just thinking, if Base theme had been styled as a simple 'nice looking' theme then perhaps all the child themes it styles would have looked just as 'nice looking' in those areas that matter to Admins, with little or not alteration from Theme designers, thus cutting back on duplicated CSS.
So the challenge is:
How would you have styled Base theme if you had had the chance?
Cheers
Mary