Indeed, as you can see on link below
http://golosd.com/witnesses
first 24 witnesses in Golos use software version 0.16.3 on their nodes.
As for Steem on link below
https://steemd.com/witnesses
you can see that the majority of witnesses use software version 0.16.1 and 0.16.0 on their nodes.
Why did this happen? Is it good or bad thing? Let's discuss it in comments section.