Agree on the hydrus UI. I love it and wish more things used a more classic style interface. It's slim, it works, and while it can admittedly be a little bit of a maze, it does practically anything you can imagine. And most importantly it's not a damn website pretending to be a UI like so many things these days. Blombooru looks like a white space nightmare imo. I will say that the tag extractions from AI metadata looks very nice though.
And thank you for the link to Find A Fox. I don't know how I never knew about this, but I very much needed it! 🦊