Lanefan
Victoria Rules
In general, doing the bolded would be much easier - and thus, probably much cheaper - were the game designed on a chassis of discrete subsystems rather than unified mechanics.Anybody can slap rules together, coming up with rules that don't interfere with other rules, that actually work for most people? That's more difficult and more expensive.
It's that which made the TSR editions so wonderfully kitbash-able. The WotC editions, not so much.
Budegetary constraints are all too often a euphemism for "we just don't want to do this"; and if they really did want to do it the money would suddenly appear.There's always going to be budgetary constraints and they are taking a more conservative approach to publications than previous editions. I simply don't see much demand for the optional rules, at least not with the people I play with.