I hope that all GL iNet routers that were NOT listed as end of life before the first announcement for 4.0 was made to this list are going to get 4.0. I have a USB150 that I have been waiting on the improvements listed in this post made back in Jan 2021:
The GL iNet 3.2xx firmware for all the routers I own is based on OpenWrt 19.07, and since 19.07 was declared End-of-Support in April 2022, we are now past getting any fixes passed down from the OpenWrt community. All GL iNet routers need to be upgraded to 4.0.