Perhaps, but I think it can be argued that it encourages more consumerism. The market for second-hand selling may encourage those sellers to buy more new.
Fundamentally the idea of an everchanging fashion is problematic, not just environmentally but also otherwise.
What’s really fun is throwing all anything plastic including wrappers, #5, #7, any metal, any paper basically anything but food into the blue recycling tub that someone comes to pick up and then I can smuggly look down on people that “don’t even care about the planet”, I’m doing my part by blankly assuming all my “recycling” isn’t going into a landfill!
... I wish I would still count the number of people that think that, but it’s too many.
I try to “not buy shit”, and Im pretty sure it’s a lot harder than wishcycling.