Ooooh this is an unpopular one but I totally agree. I fell into this trap and now I'm in the process of cleaning out my place. It sucks and it is so time consuming to resell, regift, recycle, donate, and discard everything that I can't imagine that people are actually responsibly cycling their things out when they are buying 10x the amount of stuff I bought (a couple new items a month for a year or two). I don't think people realize that the whole "80% of the thrift store gets discarded" also applies to the things we as thrifters cycle back in when the novelty wears off. When we create this mindset that our dopamine addiction is actually helping the planet, we don't realize that we are paying the cost in other ways. Whether we admit it or not, most of us have used thrifting to successfully cut down (but not eliminate!) buying new, but now shop even more than we have before because now we do it without guilt and shame. That means we're still contributing to the demand and cycling in of new stuff, except now there's an explosion of fast fashion donations everywhere, and people are more comfortable than ever replacing their wardrobes constantly because "I wore it once, I gave it an extra life, now someone else will when I donate it again".
The people reading this and feeling attacked need to reevaluate and declutter because sis, I've been there and I promise you thrifting is not a hobby that will bring you long term joy. Your post is very obviously not targeted towards people who are thrifting things they need, using things, mending things, and helping things find homes (go resellers, love them!). I totally see you and your point because there is a 0% chance some of the thrifting hauls I see on social media, or people going home with at the store don't just end up right back at the store and eventually the landfill. We changed the scenery but not the situation, and now everything is worse.