If I was getting paid for base captures, I would go with NOE smash and grab every time.
If this were a real war, and X technique were so much more effective, I'd say, Hell yeah, let's concentrate on that.
This is a game though, games can be and are manipulated to increase variety/interest all the time.
Fixed.
Let the NOE hordes play their game and you go play yours. If it's a front-line base you should expect it to come under attack. If it's a rear base how does it interfere with your game? For that matter, if a rear base starts flashing that should be a pretty big clue something's up ANYWAY so you don't even NEED the dar bar.
What's the big deal if someone gets a kick out of rolling undefended bases? There's plenty of others out there looking for actual fights. Go play with them and let the guys who don't have their fun.