Apparently Dreamwidth is planning to
update their codebase soon. Given how long it's probably gone without significant update, I wonder if the site is close to reaching the limits of modern hardware and software support for the legacy codebase. While there are definitely older codebases out there, it becomes more and more difficult to maintain such codebases as time goes on. It is reasonable to assume that it eventually would be less resource-intensive to switch to a more modernized codebase.
As advised, I've turned on beta testing for the new post editor code and the new inbox code. One thing I've noticed is that the tagset UI is...so much better. This one suggests rather than doing that awful forced autocomplete the other one does. The design looks oddly fragmented, though. I'm guessing that's a function of just not being able to devote many resources to design and being more focused on functionality. It does still seem like it is overall a nicer experience though.