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Repeating, it is loaded BELOW maximum allowable pressure. So why limit it's use at all? I don't get it. Frankly, I find mainstream +P to be a mild target load. Cases do not expand and seal the chamber which is sure sign of low pressure. The empties fall from the cylinder simply by pointing the muzzle up. Absolutely no signs of any excessive pressure. Indeed, signs of very low pressure.
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Because shooting a continuous diet of ammunition loaded right up to the ragged edge of allowable pressure, while not likely to cause a catastrophic failure, will dramatically shorten the life of a gun. You're not likely to blow up a vintage Colt D-Frame or S&W J-Frame by shooting +P ammo, or even .38/44 ammo, but you're going to have problems like timing issues and excessive endshake a lot sooner than if you'd limited the use of such ammunition.
Now, if you want to shoot maximum loads in your guns all the time, that's fine. They're your guns and nobody but you has to pay the gunsmith when you beat them up. That being said, for someone who wishes to pass their guns on to their children and grandchildren, it would be wise to be a bit more conservative about what ammunition is shot in vintage guns.