Can I use cash app instead of bitcoin?

Could you elaborate on why someone might ask the question, "Can I use cash app instead of bitcoin?" In the context of digital payments and cryptocurrency, it seems to indicate a lack of understanding between traditional fiat currency systems and decentralized digital currencies. As a cryptocurrency practitioner, I would approach this question with curiosity, seeking to understand the user's motivation and level of knowledge. Here's a simulated questioner's description: "I've heard a lot about bitcoin and other cryptocurrencies, but I'm still not entirely sure how they work. I'm familiar with using cash apps for daily transactions, so I'm wondering if I can just use those instead of bitcoin. What are the key differences? Is it possible to use cash apps in the same way as I would use bitcoin for payments or investments? Clarifying these points would help me better understand the value and limitations of both systems.