You comprehend little of what you read.

I think this is a two way street, I am sure they werent literal when staying good as new even with the correct repair it still isnt good as new. You are right about one part of the article but it is a very weak point you make, yeah its not always cost effective, especially on a gun worth 95 gbp. Regardless on how you personally feel sleeving is a very economical and practical repair, same can be said of stock repairs or splicing a stock. There are far greater examples of successes than failures for sleeving and just as the article says you have a choice pay for the quality of the repair! Using a cheap repair as an example of how all sleeving works isnt fair! Here is an example of what the article was trying to convey. The first photo is was done by a well known maker and worth the price for the grade of the gun, the second is at a lower price point per grade of the gun. You can see the difference. Both are great jobs but one was taken a step further to make a seem less and smooth transition from breech to muzzle. The other you can see where the tubes were joined but the rest of the barrel werent struck.