well, I don't know what kind of wax you are using, but if it scrapes off in 20-50 ft of skiing, I would be surprised if you could go 2-3 days with any wax job.
I have tried both. I've been hand-tuning my skis for over 20 seasons and have had more than a few random; "F*** it. I'm in a hurry." scenarios where I didn't scrape. If you don't notice a difference, perhaps you've never even really freed your structure in the first place. Giving you the exact same perception as a non-finished ride.
The truth is that base material is actually more water resistant than any wax as a material. We aren't waxing to actually improve our water-repellancy, but rather to treat the surface in an attempt to give the water a place to go... hence structure. If low-fluoros, graphites, or any wax was actually faster than base material, we would construct our bases out of a harder derivitive of any of those waxes. But it's not, so we don't. In an ideal world, we would only machine grind our bases' structures to meet the day's conditions. But that is not ideal. So we apply a temporary composition and adjust it along with our standard structure to best meet those needs.
snow crystals' shape, as well as temperature, play a huge role in that structure. Cold waxes are harder than warm-temp waxes, not because they are (or need to be) less water-repellent, but because they defend against the sharp crystals of colder snow better. (Imagine trying to ride a cotton shirt down a hill covered in needles... you wouldn't move.) Warm waxes are soft so we can easily manipulate them with brushes etc, to make strong/apparent structures to move the excessive amounts of water we ride on in spring time. Quite frankly, if you had the tools to manipulate a hard/cold wax as easily as we manipulate softer waxes, we wouldn't even have warm-temp waxes.
Every day I see people (specifically snowboarders because their bases show me such a larger picture) who have gobs of very old, white, cracked wax on their boards. Surely they've ridden longer than 50 feet? and based on the generalizations I make about that rider's ability based on their dress/the way they walk/carry a board, it is blatantly obvious that that wax job is perhaps weeks or even a season old. To them, a well waxed snowboard is similar to a well waxed surfboard, forgetting that the whole point to keeping wax on your surfboard is to provide traction to slippery surfaces in wet conditions.