Since there obviously will not be a fix till the end of this century, I have the suggestion to just implement (optional) using the USB or BT connection for anything that you would normally require WIFI. Of course it would be a bummer to not use a function that you paid for. But right now, you cannot use WIFI AND anything that is related to WIFI like music. So it would be an improvement to be at least able to download music again.
Another suggestion would be, to just delete all the crappy versions like 17.xx and 18.xx and start again with some 16.xx firmware (which did not have any issues with WIFI) and maybe do a better job this time with updating this version without destroying a pretty important functionality for many people.
Of course this is more like joke, but seriously. If you are not able to fix the WIFI issue within a quarter, maybe try another approach.
But I like the 16.22 FW... no issues I know of. And as long as I don't watch the changelog or youtube videos about it, I don't know what I miss with the updates. Well, I know one thing that I am missing... LOSING MY WIFI FUNCTIONALITY!!! It's just not worth it.
Everybody have a good day. Just needed to release myself. Thanks for understanding.