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From a maintenance perspective, the key to system longevity is to decouple interfaces and implementations. From a relevance perspective, the key to system longevity is to achieve a critical ecosystem mass.
First point: over time, you need to be able to change your internals without changing your public APIs (which users & ecosystem libraries build on). If you can't do that, you'll be forced to maintain near-static internals (a maintenance nightmare) or else invalidate your ecosytem
Second point: no particular feature or performance advantage of a system can last very long. But ecosystem gravity is extremely tough to replicate, and is the single most impactful element when it comes to *reducing time to solution* for end users (which is the end goal).
Who would use Windows without the apps? Who would use Python without the libraries? It's not the features. It's the ecosystem.
An example is in order
Software Design Principles: Low Coupling and High Cohesion
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