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This is one of my favorite things about Rails and the Ruby/Rails ecosystem. Removing features is viewed as a good thing. You might have to install a simple plugin but for all the users who don't need it that's a bit of code that they don't have to download, install, and run.

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The feature I'm thinking of is/was (I thought) a core feature of the form helpers -- form.error_messages and error_messages_for.

I think since the beginning of Rails' inception, this feature has been included in scaffolding, shown in docs, etc. I would expect most Rails apps to use that particular feature.

And that's just one example.

I think you've just proved the point. I never use the form helpers, and do most form-like things through custom javascript and AJAX calls. Including form helpers is a waste of space for me.

Not everybody builds Rails apps the same way. I think that this flexibility is one of the framework's strengths.

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