I actually read some of the research that produced the 10x number.
The 0.1x developer, if they're actually competent enough to remain employed for more than a probationary period, probably isn't at 0.1x; you're probably underrating them because you're better than average and are thus overrating what average is. (This is part of the Dunning-Kruger effect).
-10x developers should be fired fairly quickly if they're actually that negative and the business is being managed competently. I've worked with a few; they were fired within months or weeks.
The 0.1x developer, if they're actually competent enough to remain employed for more than a probationary period, probably isn't at 0.1x; you're probably underrating them because you're better than average and are thus overrating what average is. (This is part of the Dunning-Kruger effect).
-10x developers should be fired fairly quickly if they're actually that negative and the business is being managed competently. I've worked with a few; they were fired within months or weeks.