Agreed. This isn't just a trivial point either. As a decision maker this is one of my top considerations. Every org and person is different of course and there are plenty of people that don't care about lock-in as long as it's a company they trust, but it's definitely not a zero either.

When I worked for Red Hat as an OpenShift consultant, I met with many execs who were concerned about vendor lock-in. Going with OpenShift for them was a no-brainer