Compression test

[Hammerhead]

Realistically, what will a compression test tell you?
If there is a dramatic drop off on one or maybe two cylinders it may tell you you have a glazed cyl or possibly a broken ring.
Not trying to be a jerk, I'm being serious. On a big diesel you have to pop the rocker cover. If you don't have external air cleaners, it's say 15 mins to pop the top. Then you have to relieve the pressure, or pull a vacuum on the coolant so you don't leak coolant into the cyl's w/o injectors. Then you have to pull the injector rocker shafts, then pull the injector hold down clamps, then pop all 6 injectors (or 1 at a time, but I'd pull all 6 to avoid compression issues on the "not in use cyl's"), then install a plug in one (unless you have 6 compression test adapters, doubtful) cyl and THEN finally crank the engine to do a compression test...
You're now what? Honestly what? Hour forty five? Two because everything is hot as hell and I haven't even talked about evacuating residual oil from the head yet, so now the engine is realistically cooled down to what? 135-140° at best? How reliable is a compression test at this temp?
For all this hassle, f$%k it, let it cool, don't burn yourself, pull the injectors and boroscope the cylinders, it literally will tell you just as much with waaaaaay less hassle and hot oil burns...
But I am a lazy beer drinking bastard...
Once again, not trying to be a jerk, but at 135 to even to say 160°, you're still trying to do a compression test, narurally aspirated, on a forced induction engine. There is no reliable, that I know of, way to compression test a forced induction Diesel engine, not that I wouldn't like to, I just don't have access to the equipment required to properly do it...besides engine manufacturers, I don't think anyone does.
If you do or have a better plan/idea than me, please share it. I'd love to know, I've thought about this extensively before and couldn't figure it out.