As a photographer (amateur) I have tens of thousands of RAW files and in my work flow one of the first things I do is review my photographs so that I can choose what to discard or mark as worthy to develop further.
One of the most frustrating things I find and I know I'm not alone in this this is there are almost no file browsers / viewers / managers that are capable of displaying RAW files in a timely fashion.
Most file browsers are woefully inadequate in this area, they either can't manage RAW files or are so painfully slow as to render a work flow unusable.
Please, please, please, I don't want this file browser / viewer / manager to have editing capabilities or fancy gimmicks, just the ability to take a mass of very large RAW and affinity files and display them in number of formats, i.e. in grid form, film strip, etc etc very vey fast.
The manager / viewer / browser needs to able to show histograms as well exif data etc. The ability to search and display files on a range of file parameters super quickly.