this forum used SMF 1.1.19, IDK why didn't update to the latest version 2.1.3?
Because theymos want to code with things he is most familiar and comfortable with to save his time.
- I am the only bitcointalk.org sysadmin and on-demand programmer, and I'm used to the current software. Furthermore, I need to frequently make changes to the current software, but each change I make might require alterations to Epochtalk, which is problematic.
A big possible reason is that I'm the only person who does development on the current code, and my time is limited. Another big reason is that this is a huge forum with complex dynamics, and even small policy changes can have big effects which need to be thought through very carefully.