Once upon a time, the first pillar of Wikipedia read Wikipedia is an encyclopedia written for the benefit of its readers.

This is an essay. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.

This page in a nutshell: Everyone agrees that Wikipedia is for readers, but there's no policy or guideline to that effect, for various fascinating reasons

But for the benefit of its readers was removed without discussion some years ago, and there is some resistance to putting it back.

• It's helpful to new and old editors alike
• It's self-evident and uncontroversial

• The fact that it's been gone for so long without discussion indicates consensus to remove it
• It's off-topic for 5P1
• It's self-evident so it doesn't belong in any policy
• It will just lead to trouble
• It's no help to anyone

See wt:Wikipedia is for readers#Why people don't want it in 5P1.