Removal of Rendezvous support for Solaris in v8.6.0

We've just seen that the release notes for Rendezvous 8.6.0 say "Oracle Solaris platform is removed". As somone who has been using Rendezvous on Solaris for more than 20 years this is a bit of a shock, although not entirely out of the blue. Does anyone here have any insight into what is driving the decision here and what the impact is on firms who (still) use Rendezvous on Solaris?