Why is nobody talking about Bitcoin lightning network?

I rarely see any discussion about it, why is that? I've seen people on r/cryptocurrency telling that coins like Nano or even Doge will overtake Bitcoin as a currency since it has high fees and slow transactions while these coins are complete opposite. But Bitcoin lightning network is offering extremely low fees and instant transactions. So, why is nobody talking about it? It seems to me that majority of people don't even know about it, and I cannot understand why since it solves such a big problem.

Edit: thanks everyone for downvoting my post and comments just because I asked a normal question.