https://imgur.com/a/kBjhjLdWhen we first moved into our home in 2018, the grass was weak and allowed so many weeds. I told my wife that we just needed to get the st Augustine healthy and It would take care of the rest. She laughed and one day put down weed and feed while I was gone and nuked the backyard.
It didn't matter because we redid it all and sodded with Augustine-Palmetto, but the front we've just kept after with watering, manual aeration, and fertilizer/turkey compost.
I Can see a need for pre-emergents in January/feb as it starts to ramp up in water but temps are still cool.