Headlight Relay Yes No

Yeah I'm confused also. Factory diagrams shows a delay ?
Newer cars use relays for a few advantages. 1st and most important they take the circuit load off of the manually operated switches. 2nd, Less amperage equals less switch and lesser gauge wire inside the cabin.
3rd. The relay and those greater components can be placed near the need further reducing materials required.
Placing a single headlight relay before the dimmer switch doesn't do any of those things. Dimmer switch is manually operated switch ( with foot rather than hand operated ), and vulnerable to environmental elements too.
Aren't yall glad I have spell check LOL