But, for finding interfaces and read about their state and settings, aren't /proc and /sys the best way to go, if there is no worry about toctou? I was answered

But, for finding interfaces and read about their state and settings, aren't /proc and /sys the best way to go, if there is no worry about toctou? I was answered yesterday on another topic that /proc is a linuxism, but is there anything missing there ?