Switching your customers from Linux to BSD sounds like the opposite of the "boring" choice to me. The boring choice would be to leave them on their functioning Linux boxes. But I guess that wouldn't make an interesting conference talk.
Depends upon the distro, Slackware is boring, others not so much. With the churn with systemd, Wayland on Linux, things are far from boring.
On NetBSD, things cannot get any more boring. Plus I now believe Linux is owned by fortune 500 corporations and to me it is slowly heading down the same path as Microsoft Windows.
NetBSD has long support time lines for their releases. Configuration (admin) has not changed much at all. I think pkgsrc is great, I wish this could become a standard across various OSs :) All you need to do is find supported hardware. Thinkpads tend to be good, NetBSD on my T430 has no problems at all.
The only NetBSD complaint I have is I cannot yet figure out how to get wireguard working correctly as a client. But wg is still considered experimental so hoping the issues are resolved in 10.1. The existing docs I do not understand at all, but I always had a block in my head when it came to network admin.