Oh man you are really eating up the wive's tales. The only thing that will cause damage to those threads is repeated removal of the inserts.
It might be an old meerschaum seller’s sales trick, and if so it was a good one.
For my thirtieth birthday my mother gave me a Beckler carved meerschaum that is smoldering right now on the table in front of me. It’s a large, beautiful pipe of the kind you smoke around company so they can admire your meerschaum pipe.
Mama reminded me the gift came with a lifetime inspection and replacement warranty on the nylon tenon, from the shop she bought in from in Springfield.
Well, I had to get my tenon inspected there the next time I was in Springfield and my, what a glorious operation they had operating there.
The distinguished and dapperly dressed silver haired shop owner remembered selling my mother my Beckler and pronounced the tenon in excellent condition. Behind him and in front of him were meerschaums displayed in glass cases, and while he had small ones for a hundred dollars and enormous, huge ones (like the one he had out all beautifully colored on an island that enclosed his elevated chair) for a thousand dollars, the vast majority of his meerschaums cost from $200 to $500, with more $300ish dollar pipes than all others.
He solemnly informed me, that he’d smoked his huge display so much, that a CAO rep came by with Beckler himself, and THE Beckler cautioned him to rest his pipe, and he saved it from damage just in time.
If a meerschaum was smoked too much, and the screws in the shank were water damaged, he showed me a pipe that had a repair with a sort of collet that was inserted to refresh the screw threads.
After that, he remarked my mother claimed I loved fine briar pipes, and would I like to see his collection of previously owned pipes for sale?
Which is how I started accumulating pre war large ball four hole stinger Kaywoodies, Stanwells, Baris, Comoy’s, etc. I also bought several lower grade Italian pipes from him new.
I suppose a meerschaum might be smoked until it was so soggy the tenon screw disintegrated, but the average owner of a big meerschaum babies his expensive bauble and wouldn’t do that anyway.
What free inspection and replacement policies for the nylon tenon did, was get customers coming back to the shop,