Well if they'd all make the maps rush-like capturable, you'd have gameplay like the mapper intended; so you have to cap the next flag, not the one behind it etc... It would make defending a lot more wortwhile now that I think of it, as well as attacking, because everyone would go for the same flag.
You'd actually use a jeep/apc/motor what's it for, going to the front, not behind it
*Is excited*