In the US market with only physical sales you ain’t going anywhere, not even acts like Taylor Swift that is still able to pull big physical sales thanks to her big and solid fanbase in the US in the streaming era is showing longevity solely because of that.
You need SEAs (streaming equivalent album and TEAs (tracks equivalent album) to stay on chart for long time. Kpop groups nowadays are getting high debuts on Billboard 200 and then free falling in the second week because of that. Kpop companies do not realize the importance of streaming and it is affecting the performance drastically.
Even in Japan streaming is taking over and songs on their official lists are carried by streaming not physical sales (Dynamite for example). Many artist got #1 and top 10 debuts thanks to physical sales push and after that the song dropped many spots because fans already bought the copies.
I really like how kpop companies are stepping up and trying to push their acts that already have stable fanbase in many countries in the US market to expand their acts to a bigger audience in the biggest music market but they are treating the US like if it is just a “first week game” where only debuts are important and screw the follow weeks.
Fans as well rely a lot on physical sales and forget about streaming and the digital sales which is thanks to how Kpop companies push the physical sales agenda as expected since they gain the most from it.