Write first Why section

src/introduction.md

@@ -4,3 +4,12 @@ This document is an exploration on the `cardano-node` architecture and how it co
 
 ## Why
 
+The Cardano Node was developed over the last 5+ years as the reference implementations of the Ouroboros consensus, extended UTxO (eUTxO) account model and plutus smart contract language at Input Output Group (IOG, or just IO).
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+While based on peer-reviewed research and significant engineering efforts in ensuring correctness through formal methods with extensive testing, the codebase is largely opaque for non-IO Cardano developers and definitely unused outside of the Cardano ecosystem. For example, it is concerning that even IO's sister projects to Cardano like Midnight and Partner-Chains were reaching to other frameworks to build their blockchain components, despite building sidechains of Cardano.
+
+Making the ways the Cardano node is built **more approachable** to a wider developer community would not only improve development capacity, but also enable maintenance to outlive the current company & team structures. Furthermore, if we could make the components of the Cardano node be re-used **more flexibly** in diverse scenarios, this would lead to a richer feature-set.
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+After all, software quality is not only about rigor and testing, but also "how easy a system can be changed".
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+