Maybe it just suits your playstyle. Care to share your tactics so those struggling can learn to find it straighforward and easy as well?
I don't know if I'm good at the game or I just have luck
I find this mission to be very straightforward and easy, even in hard mode
My advice would be patience and to expect to press forwards together, being sure to kill all you try to, looking for the RP flash or red crosshairs to know you or teammates made the kills they attempted too.
Slow and steady, and to be fair, treat it like a load of mini survivals. Stage by Stage, sticking together and only move forward when ready. The cutscene in the finale of act 3, while may annoy those that heist consistently, is a handy minute to pause for thought too.
Hosts too must be patient. Allow teammates time to refill their snacks and armour. Many don't know we can refil at a CEO's facility too. Better that than they turn up empty handed and die more often.
These jobs are a bit more involved than the last heists. There's more emphasis on sticking together rather than have one shoot off ahead and wrap the job up quick too.
Patience is key, easy answer I do agree, but it's definitely a good starting point.
And if you take players under rank 100/135, they naturally can't take as much damage, certainly once you get to act II, the NPC's are far less forgiving. Know your teams limits.