The 8.0 rollout seems to be somewhat disorganized. NetBSD's policy is to support the last 2 releases yet 2018Q2 builds started with and continued with 6.x up until July 17.
http://mail-index.netbsd.org/pkgsrc-...msg016209.html.
Not only were resources wasted, but the entire pkgsrc code base is likely littered with patches and other mitigations for 6.x builds.