> the problems with associativity that 3-way-merge has, by forcing you to commute through each individual intermediate patch. Like, you don't need Darcs or Pijul if you'll just write some wrapper scripts around Git.

Careful here, associativity is a completely different property from commutativity. Also, Pijul doesn't "commute through each individual intermediate patch" at all, its algorithmic complexity is actually lower than Git's.