Let's also clear something up
Hezbollah is a IRREGULAR FORCE, it's not a state, and it's not a fully fledged state military with a states resources
Sure it's gets support and funding from Iran, but that's always going to be limited to some extent
Now whilst iran and the resistance can supply Hezbollah with both missiles, rockets, ATGMs and even personnel from across the mid east
Hezbollah needs a built up arsenal so if war was to break out it can saturate bomb Israel
If Israel built up forces in the north they could be hit and destroyed
Hezbollah can't afford to overplay it's hand, prematurely ejaculate and waste its resources when the time isn't right
This is why Hezbollah is using the excess it has to keep northern Israel under fire and attack whilst never going so hard that it loses its deterrence
In any Israel -lebanon war, Israel will need to call reservists and build up forces in the north
THAT is when Hezbollah can go hard, hit Israeli major cities and targets and destroy Israeli military targets in the north