New Title/Captions/Keywords editor

I used the legacy mass edit for Captions and Keywords a lot. I have many galleries and daily add to them using Smart Rules. I frequently standardised my Title/Captions and Keywords in a Smart Gallery to improve the quality of my photos listings. The tool gave me the file name for each photo in the gallery, and the existing keywords for each one. I could do mass changes (remove, add) to Captions and Keywords for all photos in the gallery or easily add captions to a few photos based on what I saw in the file name and keywords.
Suddenly this wonderful tool has been removed and replaced by a more primitive facility. I can now only make my changes one photo at a time, a very inefficient and frustrating process. This is a retrograde step and I am very annoyed (that is a polite description of what I feel!). I spent much of my working life in IT (system designer, working with programmers and users to improve their experience). My Smugmug experience has been considerably degraded. I would appreciate if you could make the “legacy” tool available to me and return me to the status of a happy customer. New Smugmug was a great leap forward, please let us move forwards not backwards