I think westerners' with rather harsh attitude toward blind box bjd aren't aware that most of them are from indie studios and artists and were made by crowdfunding with inputs and feedbacks from customers during the process. Big brands like Penny's Box and Come4Free exist but it doesn't change the fact that the majority of them are small, newly established brands, a lot of them couldn't even complete their bjd project because of the lack of funding. Also, for smaller brands, the dolls will be made in smaller batches and often will be discontinued after a year or so.
The blind box format, beside being popular in Asia, is also used to ensured that all dolls will be sold equally and you often can buy confirmed box of the dolls you want by buying in group orders or from retailers or the secondhand market. People only buy blind boxes when they don't mind getting any of the designs and even if they ended up with a design they didn't like, they will either sell or trade it or customize it. I've also seen a lot of westerners assuming that people buying blind box dolls won't be customizing them but that is not true at all, most people will custom or restyle the dolls they bought, in fact I rarely seen anyone keeping the dolls in their original styles. Brands also very much encourage their buyers to customize their dolls by giving spare parts as preorder freebies or selling them if you missed the preorder period, sometimes they even release 3d print files of their doll parts for free.
Just because the dolls are more affordable and sold in a format you don't like or not familiar with how it works doesn't mean they are "landfills" or "slop". I actually haven't seen anyone in the Asian bjd/doll community hating on blind box bjd for not being "real bjd" at all and was very surprised to learned that a lot of westerners hate them for being cheaper alternatives.
Apologize in advance if I made any grammatical mistakes or poor wording, English is not my first language 🙇♂️