Thanks tp10053. I'd forgotten the propensity for mega Carcassonne here!
As you say, as more expansions are added, the presence/absence of the original base game will become increasingly irrelevant statistically.
Likewise some of the major expansions have tiles that are relatively vanilla - I have 1,2,5 & 10 and the first three of those certainly are.
Having initially played with many of my expansions I now tend to make smaller selections - typically base + 1 major + 2 minor - so base, River, I&C, T&B, Festival and Labyrinth would now be a "mega" game by
my standards!
I wonder what base game sized selection (so circa 72 tiles) made by selecting complete expansions (major and mini) would produce the best "alternate base game" set up ...