Fair enough.
I'm not being abrasive, argumentative, condescending, or selling misperceptions of personal omniscience.
I think what happens to many, I can still do it myself but currently less so, is that we start out overly dressed. We start to heat up. We start not paying proactive attention to things like pace, over exerting ourselves. This leads to having to stop and take off layers or sweating. It can interrupt a steady rhythmic movement and lead to chilling. Even short stops to do so - change or remove layers - can chill under cold blustery wet conditions. Just by the removal of backpacks it decreases conservation of warmth. Some thought is that if we're conscious of these aspects it can play a positive role in differing apparel and layering selections...and possibly hiking with less apparel needs.
The prevailing thought is if we're accustomed to longer stops its nice to have that additional insulation. For myself I like to maintain a consistently steady long term moderate pace especially when it's cold. The goal is to not start overly dressed. For myself I'd rather steadily hike on the move slightly cool in cold weather and manage thermal comfort proactively on a micro scale without having to remove pack and consistently remove and put back on layers. I do it on the fly by opening zips, wrists cuffs, and removing a hood or taking off a beanie or Buff, taking off gloves, drinking water, noshing small snacks, and watching my pace. I don't have to spend as much time stopped and being exposed to chilling possibly needing an at rest apparel piece. These processes can be reversed on the fly to increase warmth.
I used to make most of the Top Mistakes Alan refers to. I was and still can be headstrong assuming I know more than I do especially about things like layering. BUT, humbling myself being open to further learning about apparel, layering, and thermal comfort rather than thinking I know how to do that I don't need anyone else's opinion has made me better. I darn well know I'm not the only one in this category.
http://www.adventurealan.com/top-mis...-warmer-drier/
This may also be a helpful read because folks like Alan like using fleece.