Rudder

Recompiling each time there's a modification somewhere is a bad idea.
1/ When upgrading directives:
It will fail when directives don't have the same version on a same host, I have 25 directives to migrate, build will fail 25 times... _

2/ When heavily modifying a service configuration
If I heavily modify an existing rule for a service and have to modify several config files and directives, i may/will surely end up with a broken service as the rules will have regenerated with non completely modified directives.

A system like "git push" pushing all your local commits at once would be the best way in my opinion.
You find a lot of appliances having a "commit" button that apply all modifications done in a session once.

Ps: This really should already be in 3.0!