There is nuance. Recycling exports have declined from the US [1], and a significant amount of the recycling stream of little value (non metals) is landfilled instead now [2] [3] (a quick google search will confirm, although some of my info comes from a family friend in a mid level management position at Waste Management). With that said, waste management (the practice) is atrocious or non existent outside of the developed world [4]. And even in the developed world, people still litter [5]. So! We can't use plastic, because we are collectively irresponsible. Maybe we hope it'll end of landfilled after its useful service life, but hope is not a strategy.
[1] https://resource-recycling.com/recycling/2023/02/21/u-s-fibe...
[2] https://www.npr.org/2022/10/24/1131131088/recycling-plastic-...
[3] https://web.archive.org/web/20210120215100/https://napcor.co...
[4] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6466021/
[5] https://www.google.com/search?q=why+do+people+litter
(fun fact: The origin of "Don't Mess With Texas" is from their anti littering campaign)