I'll admit, I have done my fair share of returning items I wasn't completely satisfied with, sometimes after a year of purchasing it but these were usually items I had purchased then just had sit around for a long time while I never used them. I didn't see any harm in returning them for a store credit so I could but other things I needed much more.
As an example, I bought an OR Alpine Bivy in early 2010 and used it once, in 2011, then never used it again and just recently I returned it since I realized I will probably never use it again (I'm a fan of a tent in almost all cases) so I got my 269 dollars back and baught cams (which I now need ASAP lol). Some people might say this was abusing the policy but I didn't think so.
Now I have had other items I used like crazy for years such as my REI Half Dome 2hc two man tent that I probably slept in well over 400 nights over a 5 year period in all types of climate and terrain. Naturally the zippers started to break and the fabric was filthy and becoming stiff. I simply bought another Half Dome as that IMO was the right thing to do. The cost to fix the zippers on my old text would have been almost twice the cost of just buying a new one!
I suppose the change in policy won't affect me but I can understand why others may complain. REI has also been very generous when it comes to fixing my gear. I have never had a problem bringing gear to then and getting parts, such as a trekking pole tip etc. withour charge. I'd rather do that than return it for a new one if possible.