The reasons there is a ton of talk about scaling here: a) everybody wants to start their own Facebook someday so they think they need to know this stuff AND b) scalability is actually kinda neat to study. Reorder them as you like but I think they are both factors.
That being said we are rapidly moving towards a world with more and more data being stored and queried. Scalability will therefore be something you increasingly need to know about in order to build a significant application -- regardless of your entrepreneurial ambitions.
That being said we are rapidly moving towards a world with more and more data being stored and queried. Scalability will therefore be something you increasingly need to know about in order to build a significant application -- regardless of your entrepreneurial ambitions.