today's MAC's are just like new Cars.
I love to tinker with my car, in fact my old Track Civic Type R is as basic as they come, no fancy traction control, a cable operated throttle and apart from the central locking nothing is electric. I love it because i know on the whole if anything goes wrong i myself can sort it with a few tools and thats why i keep it.
Where as my daily is a new small engined supercharged and turbocharged unit, with 7 gears which are also semi auto, has bings and bongs for everything. If anything goes wrong because everything is a sealed unit i can do very little. However i just take it back to the shop as it's under warranty and they fix a module and give it back. Just like MACs they don't repair individual parts they simply refit an entire unit.
It's that powerlessness you get on new things where they are made to be non repairable for a reason.
So i can see why people get paranoid by new MACS.
But personally i would not worry about it, as long as you back up the gold which in this case is your data then you are good to go.