Hi @Writer05 ,
I’m just a customer, and not part of the L&L team. Below are only my opinions.
I don’t recall seeing this, and I very much doubt L&L would adopt that posture. See this recent thread that contains a response from L&L support to a question similar to yours:
Note the “QT framework” mentioned in Ruth’s post. L&L did not write Windows Scrivener from the ground up. Instead, they leveraged the QT development framework to do a lot of the heavy lifting. The upside of this approach is that it enables a tiny company with 2-3 developers to produce such complex, sophisticated software. The downside is, if there is a flaw in the framework, they have to devise ways to work around it.
That is why these problems with lists are so difficult to resolve, because it’s not a matter of the devs tweaking their own code–it’s the development framework that has the problem.
Windows Scrivener v3 is built on a different code version of QT then Scriv v1, and this is probably what’s caused v3’s list problems. But no, L&L can’t just copy the v1 code to v3–it’s not their code that’s the problem, it’s the framework’s code.
I used to rely on lists (like you) for planning activities, making notes, etc., but list handling even in v1 wasn’t great, so I found other ways to accomplish those tasks back when I was using v1 and started weaning myself off lists. The only lists I use now in v3 are very simple, typically one level. If I feel really daring and the list is relatively short, I’ll sometimes go to two levels. 
I use the Outliner for anything more sophisticated than that.
The thread I linked to above has some other workarounds that you might want to try out. Perhaps you’ll find something that helps you.
Best,
Jim