Consider finding a new lfs. If they are recommending this method when there are other easier methods that work just as well, you have to consider their motive. Either they are honest and super old school, in which case I wonder how in touch they are with the advances we're making everyday in the hobby. Or, they know better but just want to get you in the habit of spending money in their store. Either way, I'd question the quality of the advice you're getting from them. A lot of the old school ways of doing things have been disproved or improved upon and this is an example of that. Good luck and happy cycling!