If short par 5's were played as par 5's, winning scores would be lower, of course, relative to par. And, as discussed here already, a lot of tournament committees wouldn't like that. If someone can change their mind and convince them that -22 is an OK winning score, then great.
But isn't it easier to let them change par on the scorecard so they're happy with -14, when the alternative might be forcing these committees to find other tactics to influence scores relative to par? These tactics could include narrower fairways, deeper rough, and of course, lenghening courses even further.
If the committee wants scores closer to par, isn't it better to allow them to change the number on the card rather than grow the rough another 2 inches higher and add another seven back tees?