Maybe I'm just really obtuse when it comes to engine overhauls and TBO times. Clearly the time is recommended. An engine is a mechanical object made of parts, parts fail. If you take care of your motor then you will reap the benefits, but if you want to run on low oil, old oil, shock cool, extreme climbs, then obviously you'll lose benefits over time.
Everyone gets wraps around the axle about 2000 hours or frankenstein engines. Factory O/H engines are merely parts that meet the design spec, meaning they didn't fail and have the same tolerances as new. So, if you think about it, you buy a REMAN engine, that had a crank from another engine with 3000 hours, that crank didn't shave metal, didn't expose fatigue during NDI, and meets all the specs of a NEW one then these parts are designed to continue until abused.
I don't see people freaking out about their cars seeing 100k miles on it. I am also willing to bet most people don't change their timing at 75k (some models). Or water pump at 120k, wheel bearings, ball joints until they FAIL!
You can argue, "well you cant pull over on a cloud". You are correct, but you as an owner SHOULD be doing oil analysis and monitoring the health of your engine and conducting preventative maintenance as required.