The gameplay is quickly devolving into mortar spam and drill abuse

I'm really enjoying the game but I've already noticed that the "meta" is quickly taking shape in every game devolving into the following:

• Ignore hotzone • Rush Tower • Build super fob • Build four Drills and repeatedly spam activation back to back • Build 47 mortars and spam other towers with said mortars • Repeat this every match Nobody bothers with the tower codes since drills are objectively superior, and due to the wonky economy balance, there's not enough incentive to fight over the HZ or engage in FOB raids (which is the most fun part of the game IMO) because of how expensive infantry kits are. So already the meta is becoming to just squat in the fob, hitting the drill to bring HZ to you over and over, and raining mortar shells all over the damn map all game long.

There really needs to be some kind of nerf to the drill and more incentive to fight in the HZ. Something as simple as only lowing one drill per FOB would go a long way. And I know this game was built around KOTH in mind, but man I really want to see different game modes around Attack/Defend style that promote a more consistent flow of combat like Squad's Invasion or Advance and Secure. The hotzone always moving results in lack of a consistent frontlines to fight over, again encouraging drill use. Something I would like to see is the hotzone move to a position and stay there for 5-10 minutes before moving again.

Edit: To be clear here, I'm not saying there are no ways around this - that there isn't anything to be done about drills or mortars. Yes I know, FOB raids and counter mortars and what have you. My issue is that I find the overall meta gameplay of hunkering down in the FOB, waiting for HZ to come to you, and bombarding everyone with mortar shells is already getting stale and ultimately a result of an out of balance economy system.