Why no getty on tty1 after using X

[Gareth Williams]

I'm running CentOS 7 in QEMU-KVM just as a play area / test bed.

It boots up in multi-user.target and I can access all virtual terminals.

If I change to the graphical.target, then I see Gnome's login screen on 
VT1 and console logins on others.  If I now login using VT2 and go back 
to multi-user.target with systemctl start multi-user.target then the 
login screen on VT1 disappears, but there is no getty running on it.

I have to manually start it with systemctl start getty at tty1.service.

My question is - why?  Shouldn't getty start automatically when I 
attempt to access VT1?

Thanks in advance,

Gareth