I stopped using Chrome when I wanted to have downloads automatically save to the desktop (no dialog).
Turned out, there was a 2 year old open bug on the missing feature, in which Google UX engineers repeatedly argued allowing the save location to be changed was counter to the desired user experience.
I switched to Firefox the next day and haven't touched Chrome since.
Was that a long time ago? Chrome has supported the option of a fixed download location for many years. I don't remember it ever not having that option, in all the time I've used it.
Correction: I think it was the ability to turn off the in-window "downloaded file bar" pop-up, which could(?) only be dismissed by manually closing it.
There are a lot of different bug reports out there asking for a flag, and apparently the Chrome team added one, then disabled it a few patches latter.
I forget what I was doing at the time (downloading PDFs for a uni course?). But it was a pain in the ass, of dubious utility anyway, and the cavalier UX attitude of "father knows best" left a really bad taste.