The short answer
wubi is a bit like leaded petrol: yes, back in the time it was a great idea and solved some unique problems, but on the other hand, it also created some new ones, so better leave it where it belongs: in history.
The long answer
wubi doesn't support UEFI, so it doesn't support some Win7 and definitely no Win8, Win10 OEM-installed Windows versions. Also, the last Ubuntu that came with
wubi out of the box was 13.10 (which is EOL).
Having said all that, this is a free, libre and open community and you can do whatever you want: if you want to support it, go ahead and if you take a strong stance that you will support it, I even want to help you and I'll send all
wubi-related questions, that I come across, to you from the chat room here: just drop by once every 24 hours so that your handle gets remembered by the room.
Me, on the other hand, all dressed up in an encounter suit, won't touch it even when armed with a 10-foot pole and a PPG ... ;-)