Certainly the conductor area isn't really an issue with a guitar/bass jack, but certainly a standard jack can lose its springiness over time, so that a pull on a lead can move the tip of the jack away from the contact and you get crackling. That is far less likely with this design as a pull in one direction away from a contact is normally pushing in the other direction against the other contact.

As the tip of a jack is a wiping contact, you aren't likely to get oxidation of the contact if the guitar/bass is used regularly. So it's now a question of fitting some and seeing about long-term reliability.

I think there is certainly a benefit in fitting them on speaker cabs and output jacks for valve amps where all the connections are via jacks, as you don't want to lose a speaker connection and damage the amp. And certainly if you are talking about a 100W or above valve amp, where the maximum output can be nearer 200W than 100W, then the extra current carrying capacity of this design would be very useful IMO.