But we only have four developers.

I know there's a disconnect here, because the articles I find on the web refer to the fact that PMOs are understaffed and PMs should do less, not that it seems like there's a PM everywhere you turn.  Maybe it's symptomatic of what I'm facing lately and not the wider IT situation.  So instead, go read 100 lessons for PMs!

Snarky: We're adding a fifth PM as there are too few for the current feature allocation.
Title: But we only have four developers.