Tube Socket Savers, why?

Unless you're pulling a tube in and  out constantly, and the tube socket is soldered directly to the board, there's isn't a need for them.

Repeated tube swaps stress the solder joint, thus possibly breaking the connection, leading to an intermittent problem  years from now.

You're spending too much time on Agon.

I have a tube preamp and the base of the socket is actually recessed into the chassis or casing. When one places a vacuum tube into the socket it sits down about 1/2 inch. This is fine for operation of the preamp, but if I wanted to try different tubes (like tube roll in new old stock tubes NOS) I would have to hold the glass of the tube, not the base that is partially hidden below the chassis, and lift it out by the glass. Rocking these old 40-50-60 year old tubes would probably detach the glue which holds the glass to the base. Not cool at all. A tube socket saver actually lifts the tubes higher in the socket by 1/2 inch and allows me to handle the tubes by the base, thus saving the integrity of the old tubes.

I must agree with @tablejockey. If you are just a component owner I would not consider them. We are constantly trying to make the fewest connections and most direct path for the electronic signal to preserve sound quality. I have owned tubed equipment for decades and never had a socket problem. I would not introduce something unnecessary.

On the other hand if you are like @2psyop it would be something to consider. Mostly for the grip he can get on ancient tubes.