I'm not so sure about the ease of triming big Oaks, Bottlefed. If you go by the standard that all deadwood as large and larger than broomhandle thickness must be trimmed (as was our standard), then large, spreading Oaks can be very tricky trims. We're talking about major limb walking which entails very experienced climbing skills, especially if you can't get a high TIP, IMHO.
I remember groundying for one very experienced climber, who'd don pole spurs for working in the big spreaders. He claimed the phone pole spurs did marginal cambial damage (which is disputable), but how the salesman had quoted for the job, he said it was the only way the job would get done in the time allotted. Who's a groundie like me to argue?
Mind you, this took place before climbers were enlightened on positioning techniques that climbers now are more aware of.
Chucky