Yes, but with the exception of sshd (which you get asked about during install), none of these things (NONE!!!) is enabled by default.

I am probably misremembering, but the OpenBSD documentation used to even explain how to disable inetd if you were too paranoid to use that. It is now disabled by default, and--I just checked one of my running systems--my machine does not even have an /etc/inetd.conf file. Most of the things running on a default install are init, cron, slaacd, a handful of gettys, ntpd, syslogd, and sndoid. Arguably sndiod is the only thing you could really remove from that list.

Why should any of that be enabled by default?

The claim was that you had to install packages to make the system useful, but it in fact has a lot of useful stuff included.