At the very least, I contend that the regulation should be rewritten to exclude the mention pressurization or that the portion in bold is written to be more clear as to the fact that pressurization and pressurized are the same thing.
Why? Why the resistance to getting proper training? I don't know any professionals with whom I associate who shun training or turn their nose up at it.
If the aircraft is pressurized, or if it's capable of flight above 25,000', whether you ever intend to go there, then you need to training and endorsement. It's simple.
The fact that the aircraft has the capability is enough, and pressurized aircraft deserve attention as well. One may well never exceed a few thousand feet of cabin pressure altitude, but it doesn't take much to create physiological effects that should be addressed in training.
Two years ago I had a very explosive depressurization in a Cessna 421, when the front left windscreen failed. It took the glareshield, some of the plastic on the wall, the headliner, and part of the top of the instrument panel with it, as well as the checklist and the AFM (which happened to be on top of the glareshield, at the time). It occurred at night, and a new student was in the left seat. His headset went along with everything else. I was giving him some training in the 421; it was his first time in the airplane. We weren't that high when it occurred, and the differential pressure wasn't that great; only a few inches, but it was enough to stun and startle and could have caused ear problems. At higher altitudes it would also have reduced the reaction time and the nature of the damage that ensued would have prevented us from a rapid descent.
I've had several depressurization events over the years; that was the most dramatic. Never the less, undertaking proper training in high altitude physiology, aerodynamics, aircraft behavior, performance, procedures, and so forth, is a wise idea, and it's actually a smart course for anyone, even if they never fly at higher altitudes.
That said, there's some interesting interpretation going on of the regulation here, that requires little more than a cursory glance at the plain-English rendering of the regulation to understand.
14 CFR 61.31(g) establishes that the requirement for that subsection addresses "
Additional training required for operating pressurized aircraft capable of operating at high altitudes." This isn't just pressurized aircraft, and it isn't just aircraft capable of operating at high altitudes. It's specifically "p
ressurized aircraft capable of operating at high altitudes." If the aircraft is pressurized but can't operate at high altitudes (defined next), then the high altitude endorsement isn't required. If the aircraft can operate at high altitudes but isn't pressurized, then the specific training and endorsement isn't required.
One should seek specific training in high altitude operations anyway, and in pressurized operations anyway, if the aircraft is pressurized, or capable of high altitudes, regardless of the regulation.
14 CFR 61.31(g)(1) lays out the ground training requirements for pressurized aircraft capable of flying at or above 25,000'. That is to say, if the aircraft is pressurized
and has a service ceiling or maximum altitude (whichever is lower) above 25,000', then the endorsement is required.
14 CFR 61.31(g)(2) lays out the flight training requirements for pressurized aircraft. The language of 61.31(g)(2) differs a little from that of 61.31(g)(1). In this case, it specifies pressurized aircraft, period. It makes no reference to altitude capability. In this case, if it's pressurized, then it applies. The subheading 61.31(g) specifies "capable of operating at high altitudes," but subparagraph (g)(i) does not; additional training is required in pressurized aircraft.
A logbook endorsement and record of training is required for the ground portion, applicable to pressurized aircraft and high altitude operations.
A logbook endorsement and record of training is required for the flight portion, applicable to pressurized aircraft.
Whether the aircraft flies high or not, if it's pressurized a pilot needs, and ought to willingly seek, training in pressurized operations. Whether it's pressurized or not, an aircraft that flies high needs and ought to seek training in high altitude operations. This is not wasted training. Additionally, anyone considering high altitude flight out to make the effort to book time in an altitude chamber to see the true effects of hypoxia for themselves.
A good example of an exchange between a hypoxic pilot in a Learjet, and controllers; listen to the way the PIC sounds drunk and uncoordinated. He thinks he's fine and that the aircraft has a problem:
http://www.youtube.com/watch?v=0p8JXPRVE6M