Is there a specific reason why engineers decided to use so many torx bolts on the new MB models? My W140 requires a torx bit to remove the transmission pan. It requires an external torx socket to remove the covers to change the spark plugs. The intake manifold is secured with hex bolts, but the two bolts closest to the firewall are torx bolts.

Is there any engineering reason for using torx instead of hex or is MB simply trying to make it inconvenient for owners to work on their vehicles? I've never seen any torx bolts on my W201. It's not that big of a deal anymore now that I have the torx sockets, but those external torx sockets were a bit hard to find. I don't see why an external torx bolt would be superior to a hex bolt just to hold down the plastic covers over the plugs and coil packs.