You're right.
It's never-ending. I have a 6.9 and the starter is right beneath the passenger side exhaust manifold. The last Bosch brand-new at 750 American dollars lasted about 15 mos.
All my vacuum lines and lots of the rubber goes crunchy after a few years.
A black car and Houston summer (11 months) doesn't help either.
Open the hood on a summer day after a drive on the freeway and it's like sticking your head into a barbecue pit. MMMMM barbecue.

My car's in the shop getting painted and I am going to have the bodyman work some kind of way to exhaust the heat that builds up with no place to go.

I have seen a 107 (the famous green AMG w/a 7.3) that has fender louvers and they don't look too bad. I really don't care what the originality police say anyway.

I think a hood louver might just dump all the hot into the ventilation intake at the bottom of the windshield so that's probably not good.

Lower underhood temps result in more power, so there's more than one reason to look for relief here. I have been thinking inner fenders exhausted to wheel wells, but keeping wet out is always part of the problem for engine vents.

Finding a cosmetically acceptable solution is difficult.