I've been a webmaster for 18 years now and run 1500 websites. I've hard coded some of them on notepad, ripped apart wordpress and done my own themes etc etc. I do know my way around hosting etc.
Yet a simple upgrade from 3.08 to 3.1 utterly defeated me. A simpler upgrade from 3.0.8 to 3.0.14 handed me a list of over 100 files to manually upload to various directories. Just upload the install file and vendor file. Good luck there is no vendor file in the zip files.There is a docs file but no instructions as to what that was for even though there is one in the current installation. It didn't say replace it???
When I started I saw another post where someone said they were just going to delete the forum and start over. It as simpler. I laughed. Silly me I'm headed over to delete the DB and the forum folder and look for something else.
Forgive me for saying but my impression is we have a bunch of code jockeys running this software. I appreciate the free work that goes into all of it just as I appreciate wordpress. But the difference is night and day. With wordpress I click a button and it updates automatically. In fact with an updater plugin it all updates automatically, wordpress, themes, plugins.
The wp plugins like akismet defend against spammers something PHPBB lacks big time. I have spent countless hours deleting accounts and attempted spam postings. Even with all the tips and tricks there is still a major problem there.
I think that you coders have lost sight of the fact that the average webmaster just isn't up to your skill level and understanding of the underpinnings of this software. I think you've lost sight of the people who actually have to USE IT.
Wordpress is popular because they've dealt with these issues and simplified them. You...not so much.

JMO