'Main processor' meaning the SoC used in a modern high performance device. Phones, tablets, or computers.
Plenty of lower power or older stuff (RPI included) use older nodes just because that's available. Microcontrollers tend to use higher nodes (22, 40, or 55nm) just because they don't need the super high speed stuff.
Also, the RPI5 uses 16nm, not 22nm. Still not modern, but not unheard of for stuff like SBCs where performance is not particularly important compared to cost.
Plenty of lower power or older stuff (RPI included) use older nodes just because that's available. Microcontrollers tend to use higher nodes (22, 40, or 55nm) just because they don't need the super high speed stuff.
Also, the RPI5 uses 16nm, not 22nm. Still not modern, but not unheard of for stuff like SBCs where performance is not particularly important compared to cost.