Hi there! First and foremost, thank you for taking the time to share your thoughts, it is appreciated. As a personal note to start with, having been here for several version changes, every time we've changed DeviantArt to a new version of the site (be it a full change of the site appearance and function or even just adding new features), we've had people say they don't like it. Even the old version of the site, which you are advocating for now, had complaints prior to and after its release. There always is a conversation about a majority, and how a majority dislikes one thing or another, and in many ways it's something we always do our best to be mindful of.
We were especially mindful of this when building and releasing the new version of the site to deviants. We've constantly monitored how people use the new version of the site compared to the old version, to make sure that the new version performs better in terms of the major features and functions of the site (e.g things like deviation views, favorites, and comments). This is important to make sure your art and other content is being seen. We took our time to make sure we built a version of DeviantArt that the community continues to engage with well, and we've spent the time since its initial release to beta testing in November 2018 to ensure it does well. Both in looking at data as well as listening to feedback from deviants in that time, we've also made many changes, tweaks, and additions to make the experience better.
I agree with you that the new version isn't perfect, but the goal isn't ever to make a final product. Rather, the goal is to make a better experience, and then iterate on it from there to continue to improve on that experience. This will allow us to bring deviants new and requested features, and introduce more that people can do on DeviantArt that we can't do when locked in to the old version of the site.
I hope that eases your concerns, and thank you again for reaching out.