What would you rather do? 50 more hours of steep turns, stalls and precautionary approaches? Or 50 hours of aeros, cross country flying in weather, at night, some floats, or whatever else you can get the opportunity to do?
who says you can't do the latter before a cpl test? Personally, while I agree about your assessment of the test, one feels that the spirit of the time building portion of the cpl license is the "take the time to learn, improve then come back and show us how good you are". Instead of "scrape through it as soon as you feel you are just good enough". Yes I get what the realities of the training are, we got pilots just after a piece of paper. I know a few of those now, its unfortunate. The CPL in a perfect world would be a journeyman's flying training in the oldest sense of the word, in fact that's what i would recommend to anyone doing it, if you can learn a lot of different things, then the test will be abreeze rather than focus just on the test aspect. Want to be good at the soft and short field exercises? Go get a float rating or find a ski plane to fly. Want a good exercise in systems knowledge? Get a multi rating in there. You have troubles with steep turns, spins and stalls? Get some acro time.
You're right, your skills aren't frozen at the test, I just feel that the results of 200 hours of flight training and time built should be better than 150 hours if the time is used productively, and blowing away the test is a goal worth shooting for, or at least instilling in students. Maybe not. Again, I'm just wishing how training would be.