It's the little things that matter to him. However? That is why we fully understand those who run to top companies such as the Action and Aldi to buy those beautiful aluminum valve caps for a minimal amount.
Those things can be true jewelery for every classic.
Oh yes: So they are made of aluminum. The valve stems are made of chromed brass.
Those two materials have - probably without their knowledge - a different electrovalency. A potential difference. That gives tension bodywork. As a result, the valve caps are placed on the valves in a slightly humid environment.
With some bad luck, you unscrew the valve from the rim while the cap keeps firmly embracing the valve.
A lick of grease during the initial assembly, and then once in a while between the companies would have helped.
But who takes the trouble to lubricate his valve caps?