Because Bitcoin is slow, Bitcoin transactions are expensive and Bitcoin is transparent and not everyone wants to use it. I believe in a free market and that includes when it comes to money. I don't like the idea of "we have established bitcoin so just follow us and shut up" (which is the mentality of a huge percentage of bitcoiners) I don't like the idea of layer 2's because the further you remove yourself from the base currency the easier it is to control.