Since the OneMesh does allow wired backhaul. Will adding another Archer A7 as Wired Ethernet AP will give better throughput/coverage vs using a wireless OneMesh?

I feel that I should be able to get theoretical speeds of C7 from the AP, is this correct? 

Current Setup:

Main Router Archer C7

Plan to Add:

Gigabit wired ethernet cable from the main router to Archer C7 setup as AP (instead of OneMesh device) with the same SSID as the main router.

Will this be a better option since I have a wired ethernet available vs OneMesh?  Again the whole reason behind this is to increase coverage where wifi signals are weak but have access to eythernet.  Would you do anything differently?  Thanks for your valuable insight and opinions.  Ray