I wasn't serious about the budget cut, I just used it as the only plausible excuse, feigning ignorance, you normally want a big plane carrying big loads.That has nothing to do with budgets.
It was stated from the beginning that the end design will end up being smaller in size. Which is an advantage for stealth aircraft and a show of the capabilities of squeezing all the equipment in there.
Lighter weight, more compact, and lower RCS.