As I explained to you already, the thread was closed as it approached 500, as are ALL threads on SR due our website capacity. Clearly we cannot stand here and observe and wait until exactly 500 is reached. In fact, I am heading off to work in a few moments, because, Yes, I have a day job. So, it's normal to close a thread as it approaches 500 or just after it passes 500. We certainly cannot be precise with the 500 mark.
All continuation threads are in the Daily Support forum.
If you read through any of the long threads, you will see there is no 'explaination'. I merely write 'lContinue" and give the link, or "the last part" and give the link.
Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our light, not our darkness that most frightens us.