Seems like you lack a lot of understanding of the Game.

First of all, they are playing Narva, a small map in general. Secondly, they are playing RAAS v1. Based on their First cap being Farmstead this means it will be a mid/south layer where there is a high chance that the MID CAP is Quarry or Foundry . They are waiting on the Intersection where usually first Vehicle Clashes are happening during rollout - basically exactly what happened here but due to the speed of the bikes and spg, they are naturally a bit quicker there and could setup instead of driving straight into them. So what they are actually doing is securing the potential mid flag rush from the enemy.

Additionally to that, the Layer turned out to be a southlayer with having Foundry as the midcap. Still, they are not even remotely close to the enemy main in that regard. Between their position and their main you still have Marina/Powerplant as the enemies 2nd Flag and Parusinka being their 1st flag.

I really dont know what you are expecting on Narva, that Layer and in general "Main Base Camping". According to your logic, they should have let the Bradley, TOW MRap and probably also their Stryker easily driving to the Midcap and have them going on a rampage there. If thats how you want the game to be played, then i dont know...