I've got several man pages for qemu (FreeBSD 13.0, qemu-5.0.1)
$ apropos qemu
qemu(1) - QEMU User Documentation
qemu-img(1) - QEMU disk image utility
vdeq, vdekvm, vdeqemu(1) - Virtual Distributed Ethernet wrapper for QEMU/KVM virtual machines
qemu-block-drivers(7) - QEMU block drivers reference
qemu-cpu-models(7) - QEMU CPU Models
qemu-ga-ref(7) - QEMU Guest Agent Protocol Reference
qemu-qmp-ref(7) - QEMU QMP Reference Manual
qemu-ga(8) - QEMU Guest Agent
qemu-nbd(8) - QEMU Disk Network Block Device Server
OTOH, there's no manpage for qemu-system-X, so maybe that's the confusion.
Also,
>the pw man page is much scarier than NetBSD’s useradd.
FreeBSD has an adduser(8), which is a bit more friendly than pw.