There are modest but real improvements in efficiency and resistance to multiple cell degradation mechanisms. Cell lifetime does not have a hard cutoff. Typically a panel's lifetime is limited by failed backsheets or wiring/soldering rather than by the more gradual optical-electronic degradation mechanisms that gallium doping helps prevent.
https://en.longi-solar.com/home/events/press_detail/id/228_G...
There are modest but real improvements in efficiency and resistance to multiple cell degradation mechanisms. Cell lifetime does not have a hard cutoff. Typically a panel's lifetime is limited by failed backsheets or wiring/soldering rather than by the more gradual optical-electronic degradation mechanisms that gallium doping helps prevent.