Could be so massive to load, though... the textures loaded into memory would be massive...
Well true today anyway. There will always be computers that struggle, although the baseline average is increasing daily.
We could save buckets of RAM if we really wanted to. After feeling around and putting forward suggestions, I've come to the conclusion that we aren't so interested as a community. And that's probably a good call.
And resources are a huge issue,
Yes, what would be nice is a resource and armour mapping system. So everyone can keep their techtrees, but use them as a guideline only.
as well as balance.
Balance can be tweaked, and fun can be had playing with friends despite imbalance.