It's the same reason for favoring defaults. They are universal, and everywhere, and lets one get to work immediately. Constantly porting over customizations just so a spoiled butt can work comfortably gets tiresome. It's even easier than fussing about trying to automate the whole thing...

Bash is intentionally scoped to be small. The language seems almost intentionally difficult to grok for large projects. There are very few legitimate use cases for large bash scripts, in my opinion, and frameworks only make that harder to see. Javascript also started scoped small, but it was everywhere, and look at it now...