If you won't use PEAR you might as well not use PECL. And then you'd be in trouble, since many of PHP's existing extensions are getting moved there to keep the size of the core package down.
The whole point of being able to define functions (and hence classes and libraries and packages) is so that programming interfaces can be written that are appropriate to the situation at hand, without having to do everything in terms of whatever the core environment provides all the time.
(Oh, and is that a typo, or did you mean to write "weary"?)
