Every salary range I've ever seen has been negotiable unless it's for government or tertiary roles. I don't understand how this helps except for quickly assessing who the top players are in the market, which you'll already know.
In Austria companies are already mandated to post salaries for job descriptions. Some companies are very vague about it (here is the mininum, based on your experience you can negotiate,...), some are very clear about it.
For me it helped filtering out companies and saved me a lot of time.