Am I concerned about weed resistance? Mildly.
There are numerous chemical combinations that I can employ to treat my fields, some expensive most others reasonable. You just can't go out there and spray any old chemical and expect a result, you have to target the herbicide to the weed you are dealing with. Don't expect to spray a chemical that controls broadleafs and get grass control.
I can apply preemergence herbicides to prevent weed growth in the first place, or I can rely upon total post applications.
Liberty, Lightning are examples of easily applied, reasonable cost herbicides... and have different mode of action than glyphosate products. At worst case, I can mechanically control the weeds if necessary. With the large amount of herbicides available today, super weeds are just bogey men... they easily disappear in the light of day.
Clearly you are not concerned about the LIABILITY of weed resistance. You should be.
You just can't go out there and spray any old chemical and expect a result, you have to target the herbicide to the weed you are dealing with. Don't expect to spray a chemical that controls broadleafs and get grass control.
I use at least seven pre-and post emergence herbicides on over eighty target species, thank you. I have used spot, broadcast, and CDA (upon a method of which I hold a patent on a method that relies upon classification of direct versus satellite droplets in a log-bimodal distribution).
I do not have the option of tilling because THIS IS NATIVE HABITAT on very steep ground, much of it having over 100% slopes on highly erosive soil. Most often I spray individual plants, even grasses. You have no clue how demanding that can become among over 220 native species, each with different responses due to variations in light, soil, and terrain conditions. Farming is kindergarten by comparison.
In this area, weeds go from emergence to seed in as little as four weeks. Everything grows here.
At worst case, I can mechanically control the weeds if necessary. With the large amount of herbicides available today, super weeds are just bogey men... they easily disappear in the light of day.
If we had a range of effective, inexpensive, and benign herbicides obtainable without massive regulatory hassle, I might buy that flippant assertion. We don't.
You have clearly never attempted what I do.