I respectfully disagree that years of shoeing creates poor feet 
Trimming makes or breaks the foot. Shoe and nail placement further improves or degrades the foot.
What years of shoes does do is sometimes (often? definitely not always) create a foot that takes a bit to get used to more intimate ground contact, especially harder and lumpier ground, with more sole pressure. Some farriers create a healthy foot except for regularly paring out too much sole all the time, so that has to grow back to its full thickness.
A shoeing setup that doesn’t create enough frog pressure can mean a bit of a sore frog for a while, but that shouldn’t take long to toughen up.
Neither of those things should take 1-2 years to resolve.
It is true that the environment has to be conducive to creating a healthy foot. I was ready to take JB barefoot months before I actually did, because 2-4 hours of turnout was not conducive to going barefoot. I waited until he had much more turnout.
I am not talking about using shoer type farrier as IMO most of them will continue to trim your horse the same way as when they are being prepped for shoes. In most cases this trim takes off too much sole and leaves too much toe out front.
That farrier shouldn’t have been trimming that horse to begin with, much less shoeing him
They are the ones who cause problems if you just take the shoes off and expect that unhealthy foot to just deal with things.
Any competent farrier trims a balanced foot, and only does shoe-appropriate things to deal with the shoes - leaves the ground surface flat and yes, might need to take a bit of extra sole around the edges so the shoe doesn’t cause pressure.
I don’t know that “most of them” do that, but for sure there are pockets where ALL of them do, and there are far, far too many around the country (and world) who do. But there are also a great many who trim properly.
I feel horrible for people in “deserts” where there’s nobody, farrier OR trimmer, who has any right to be under a horse 