Question
You said in one of your posts to someone starting a new lawn, "Above all, NEVER use those mass market weed killers with things like 2,4-D and other weapons of mass destruction; they're advertised as shortcuts, but you'll be stuck putting them down
every year, for the rest of your life, instantly wrecking the soil chemistry and wreaking unspecified long term damage."  For the most part, other than a new area I planted in April that took a beating this summer, I have a gorgeous lawn.  Best in the neighborhood, but it isn't perfect.  I'm aiming for perfect.  :)  I did have a problem with what I think was annual bluegrass this past spring.  And nimblewill from my neighbor's lawn showing up in small patches in mine. (I pull it out.)  I have always used Scott's products.  I want to switch to organic, but what you said above makes it sound like it's too late -- like my lawn is addicted and can't be switched over now.  Is that true?  Thank you.
Dale

Answer
First, a disclaimer. I did not make those statements which you attribute to me.
I am a firm believer in IPM -Integrated Pest Management- a choice of one, or a combination of, various methods to control a pest -plant or animal. Here are the various methods.  You choose.
Manual: 'By hand'. This includes pulling weeds, using a shovel, fork, rake, broom etc.
Mechanical: Use of motorized equipment like roto tillers, rotavators, mowers, blowers etc.
Cultural: Something that is done routinely when raising a crop e.g. mowing a lawn or pruning a hedge.
Chemical: Applying a product, usually synthetic, to a crop for a specific purpose e.g. insect, disease or weed control e.g. glyphosate for killing plant material.
Biological: The use of a living organism for pest control e.g. ladybugs against aphids.
Integrated: The application of any one, or combination of, the above methods against a pest problem.
"Organic" for me is a moving target. In different situations it can mean different things. There are 'authorities' that certify "organically grown". Sometimes I am in doubt as to whether it means "no synthetics" or "only botanicals permitted".
I hope you understand why I cannot answer your question with certainty. All I can advise is to choose a method or combination; if you do have to use a chemical (synthetic, plant derived, or other) choose the most benign product and apply it at the lowest effective dose.