Flyburg
Yes our random routes overfly the NATs all the time. We better know where we are in relation to the NATs so if we have a problem we can align with the NAT and driftdown 15 nm offset. Yes we may be busy at that point but having our route plotted and having the NATs already plotted makes life a lot less busy. As for TCAS taking care of all collision avoidance, if you could ask the crew and pax of the Gol 73 that collided with EMB jet over South America. They both had TCAS.