Very interesting hypothesis - I'm getting ready to order a 2 pack at 35% off (hallelujah back to school sale) and think I will try this daylight trick. I'm also curious about the Roopose competitor but can't find anything out about them and their video tutorials look way sketchier.
So how is the Roopose turning out? All of my WSD have spider cracked like you guys are talking about (3 protectors I think I've gone through) but didn't realize that's what it was called and just assumed that's "what happens" with the LD screen protectors. I saw the roopose and am curious but...