Are L2s parasitic?

Recently, I came over such opinion frequently, summed up in this article: https://bitcoinist.com/ethereum-dying-l2-dance-on-grave-ceo/

The cyber capital CIO believes that L2s, while designed to scale Ethereum’s capacity by handling transactions off the main chain, are now operating almost independently, thereby fragmenting the ecosystem. This fragmentation, according to Bons, is breaking up liquidity and composability, crucial elements that facilitate seamless operations across the Ethereum network.

What is the counter argument for this?