I think there is a happy, healthy medium needed when trimming the frog as is true of the sole.
To "tidy" is far different that to scalp..
And any farrier who scalps and sores should be walloped!!
But to not
tidy so debris is not
trapped, flaps not
snag and tear is wrong too.
Here where it is rainy season and feet grow fast and furious on my guys my farrier does tidy those frogs...
He left them one time cause I asked...raised his eyebrows at me and said OK but you won't like what you will be dealing with with your guys in a short period of time...
I had pieces dangling, catching roots and harsh grasses, debris caught and embedding under those flaps...and more importantly where dead tissue was was the breeding ground for thrush...here to easy to get and hard to get rid of.
With the rains also come softer feet and that includes underside of the hoof on mine, so tidying prevents injury of rips and tear of flaps overlong waiting for "the shed"..
So, we trim back conservatively and tidy the frog, leaving as much as we can but not creating a host environment not healthy either for rips/tears and injured foot to occur nor "disease" to get a host location and if now a tear does occur the "in" to set up house...no thanks.
But I also don't want a carved pointed frog with no protection of the foot either...
A happy medium is needed...sounds similar to the 3 bears fairy-tale.
When I see ratty frogs I look at the farrier and give them "the eye" too... a healthy happy medium please.