These are my opinions on the matter.
That is a very simplified view of the tools needed when editing.
How would you temp a needed split?
What type of video cross fades should be available?
Import export of XML/EDL?
Text scrolls?
Graphics handling?
Basic Color correction and LUTs? Etc.
While there may be quite a bit of overlap between picture and sound editing for Resolve to eventually mature to a usable level, I am quite sure it will never turn into a compositional tool.
I also do see the value of being able to link picture and sound during editing. But so far not even Avid has managed to do that. Adding a full NLE toolset to a DAW is no simple matter. And if it’s not a full NLE it is only useful for the odd type of productions that don’t need or use a professional workflow. Thus it is unlikely to make enough money to pay for the investment.
All IMO of course.