In reply to sniffy:
i work with YKK a bit (office is same building) and its a difficult equation.
good zips are not cheap (fancy materials, skilled installation etc), and to push up a jackets price over something the consumer tends to see as a detail is hard square price-wise.
by example, some new mammut jackets use a special zip where the teeth affix direct to the fabric rather than a bit of tape. much more snag-free and compacts smaller etc - all things the consumer wants, but dont want to pay an extra $50 for on top of the sort of garment that warrents such innovations (doesnt make sense either to outfit mid-level garments with highend features).
as stated above - half the problem is the weather flaps over or under some zips, or the use of sheathed zips that deflect most weather but sometimes still get a flap behind to keep wind out. alone they are as snag-less as is consumable, but because they feel cold from the inside they dont sell.
lots of zipless designs exist, but they are even harder to get on shelves due to the consrvatism that pervades the outdoor gear market. indeed there are hundreds of amazing innovations about - but consumers dont want them in the numbers needed to produce. recall that most gear is made in minimum volumes of 10s if not 100s of thousands...
think; if a zipless jacket that worked but cost $600 was on the shelf, would you buy it on that aspect alone?
agreed tho, zips are a problem. but theres a lot to it.