It's not exactly equivalent. A lot of people were already using links before, but the BBCode was more "abstract", and it would allow you to change the URL format of your community (or even change the domain) without getting broken links, for example. Unfortunately, it seems the trend is for IPB to move away from abstract markup to HTML, without understanding the downsides of the move.
PS: And I think the link Morpheus NS provided discusses the removal of the posts numbers, which means people cannot refer to a post by its number. But this number has nothing to do with the post id. (Actually, I never liked to use post numbers because they change when we delete posts, which means they are not a reliable identifier.)
It is supposed to be used by crawlers, so that they can easily find the (new) pages of your site. More info: http://en.wikipedia.org/wiki/Site_maphttps://support.google.com/webmasters/answer/156184?hl=enAlso, IPS uses a sitemap index, which links to the sitemaps with the links from different areas of the suite.
I agree that the post number may sometimes be an easy way to identify a post. However, those are a little bit "fragile" to be used as identifiers: if you hide/delete a post, the posts numbers won't refer to the correct post anymore. In any case, an easy way to copy the post ID could be useful. It shouldn't be difficult to change the "Share this post" modal to show this information though.
I prefer Apache Worker (with PHP-FPM) over Apache Prefork (with mod_php), as it usually makes a better use of RAM. However, I think Event provides even better performances. AFAIK, both Worker and Event do not work with mod_php, which imply some additional configurations to use PHP-FPM.
It would be nice if admins were allowed to select the available notification options, otherwise it's difficult to control the volume of emails generated by the community.
Also, I think the options provided are not particularly good. On one hand, the instant notifications send to many mails (it may be useful if we want to follow a topic from the email). On the other hand, the offline notifications makes me miss some updates, as it does not send me an email when I'm online.
What is the reason to not send emails when the user is online?
Anyway, I think an intermediate option, similar to offline, but that sends notifications even if the user is online, is needed. AFAIK, this option is present in other software such as vB, SMF, or phpBB (but more important, this option makes sense to me).
This feature would be really nice...
Give people the ability to choose the editor and the markup language used. You could provide an editor that just uses HTML (and forget about BBCode conversions). Those who want to use BBCode would only have to create an editor and a BBCode to HTML converter. The same would happen for Markdown, Textile, or any other markup language people want to use in their forums.
I always assumed that before the validation a user could not login... I believe most of users if do not receive the validation email either register another account or go away.
So, I think this feature request makes sense.