I don't think there's any disagreement about using the right tool for the job. What I took from the original MicroPHP Manifesto is that the solution is not to have a ton of hammers to choose from. Instead, make sure you have a couple different types of hammer heads and a couple different types of handles that you can mix and match so that the right hammer is always available.

This way your toolbox is much lighter and easier to carry around (easier to keep up to date with improvements to the code and easier to maintain). I think it's about breaking things into smaller pieces.