The founders of the Gemini exchange said, there are a few more projects other than BTC that they pay attention to, simply because Bitcoin is not good for everything either. Ethereum has decentralized the running of apps as an operating system, Filecoin could severely stifle Amazon Webservices or Microsoft Azure.
The basis of Bitcoin maximalism is that the BTC network is the most stable, most reliable. This is true. But it will not be a universal magic potion. It is the perfect value storage like a kind of digital gold, but what gold does not know, Bitcoin does not know either, apart from the code vs. physical object debate.