Where Did Nikon's Lighting Innovation Go?

Nikon once owned the speedlight game — their wireless TTL system was genuinely ahead of its time — but they've released nothing new in over a decade while Godox ate their lunch. This is a speculative 'what if' piece, not an announcement, so don't get excited; but it's a useful reminder that if you're shooting Nikon and need a serious flash system right now, third-party is your only real answer.