How do ENIG gold capacitive touch buttons wear over play time?

Hi all. Does anyone know how long the gold capacitive or resistive touch buttons on a lot of modern synths last? I'd assume that after a while the gold would wear away exposing the nickel underneath leaving it looking bad and not fun for people allergic to nickel. JLCPCB offers 1 or 2 microinches of gold for ENIG which I can't imagine will last long with direct contact to fingers. Currently brainstorming a synth design and would like to use capacitive touch for the interface.