The first reference you have there (http://www.epicski.com/forum/thread/38709/scraping-not-scraping-wax-before-skiing) is back when I didn't brush. I've since changed my tune (ha ha) entirely for spring skiing. I've found that the skis are far less grabby for that crucial type of natural snow in the spring when it's just starting to change over to slush (I'm not talking later spring conditions when there's been several freeze/thaw spells.) if you've got that structure well brushed out. Actually, I now brush all the time, but especially for the early part of spring, I'm thorough. In fact, this year, I got a fresh base grind when I took a look at the structure and parts of the ski were too smooth where the structure was wearing off. I don't like getting base grinds as then getting the base thoroughly saturated with wax again is such a PAIN when what I really want to do is SKI, but the difference that new structure made in my glide was noticeable. The trouble at that point was then I was waxing after every ski day to get the wax built up in the ski again because at that time of year the morning snow was so coarse it was impossible for me to have the "right" wax that would survive the AM and be right for the PM. Having the wax last through the day was hard enough, lasting two days? Ha!
And, having broken my wrists with a bad skiing accident three seasons back, I am NOT looking for more excuses to SCRAPE, believe me! I find scraping to be exhausting work. But, in the spring, I wax and scrape and then, of course, brush, to keep the skis saturated, the bases clean, and the structure clear because more than anything I do NOT want to come to a sudden stop and go face first and have the bindings release while the skis decide they can't glide. Better I should tune than I should get hurt because I was too lazy to take care of my equipment.
Now, as spring gets later and later and there are lots of freeze/thaw cycles, the grabbiness problem seems to disappear until fresh snow comes along again. Depending on the amount of that fresh snow and how it mixes with the existing corn, maybe the openness of your structure won't be an issue, but if you're finding your skis are feeling like they're trying to move across a rubber mat, the problem is you have water filling up your structure and creating a suction effect, slowing you down. That's why some people actually have "spring skis" with a LARGER structure ground into their bases, so that doesn't happen. So, obviously, leaving all that wax on your skis goes against the idea of a nice open structure entirely, doesn't it?