I come from EndeavourOS and when I installed Arch manually, I realised that I had to systemctl enable quite a few services. That included NetworkManager and sddm.

I was wondering if there exists some PostTransaction hook available that would prompt me about enabling a service/socket after a package installs one?

So, if I were to do pacman -S extra/bluez-obex, it would later prompt me with:
Enable obex.service? [g|global] [u|user] [n|no]
And if I were to answer with anything other than "no"...
Start now?

Might be different for system services, but you get the point.