[Catalyst] Plugins vs. Base Controllers

[Mark Blythe]

Spinning this off into a new thread.

> So make it a controller base class.
>
> People make everything a plugin by default because it seems like a good idea
> at the time. This has resulted in massive compatibility issues due to
> namespace collisions.
>
> Don't Do It.

I've pondered the "controller vs. plugin" choice myself several times,
and I see I'm not alone.  I see the namespace issue with plugins, but
does the potential for conflict make all plugins evil?  This is
another area where a clear best practices would be quite helpful.
Matt, could you share your thoughts on when it's appropriate to choose
a plugin over a base controller and vice versa?

I'm guessing plugins become necessary when you need to get your hooks
into a specific piece of Catalyst framework logic in order to achieve
your goal -- like overriding and extending a method.  Is a controller
preferable in all other cases?

Anybody else have thoughts on this?