If the description is less than 10 words, they give you a snide comment "Oops, your description only has 5 words!"

Don't they know a picture is worth 1000 words?  Occasionally, a photo will need some clarification, but most of the time a good stock photo's content will be obvious from looking at it.  Shutterstock, which sells far better than Dreamstime, doesn't even ask for a separate title and description except for editorial photos.

The most annoying thing about uploading to Dreamstime is that it's a waste of time because it hardly sells.

Writing a 10-word description isn't that hard, for example:

"Bright red and round tomato isolated on a white background."

Don't give away your secrets on an unfilled niche ;-).

The most annoying thing about uploading to Dreamstime is that it's a waste of time because it hardly sells.

Writing a 10-word description isn't that hard, for example:

"Bright red and round tomato isolated on a white background."

agree
if the time spend on adding the metadata or name of submission should be 10 words sentence it is possible, but is it worth it if it not sells good enough to be worthy for you to  stent that time?

I personally would spend this time on site that better sells and not so hard in submission process.