Well, it doesn't really matter if you agree or notNo guys I'm not agree with you, because if I want delete a post I want delete a post, not the thread.
You mean the old user created the thread and you deleted the thread.In my case a deleted old user created the first post in a thread where him only add a photo with 2 words of text
My friend maybe for you it doesn't matter, but for who develop the software can be interested in this seeing that is not a normal behavior. If I want delete a post is not mean that I want delete a thread, the thing is simple, are 2 different commands and as this should work. IMHO.Well, it doesn't really matter if you agree or not
It has been designed this way (which isn't uncommon, vBulletin for example has the same behaviour) since version 1.0 and most likely won't ever change.
As pointed out, in most cases this is a non-issue and there are workardounds if it really would be necessary to delete the first post without deleting the thread.
It's mean that the old user have created a thread and now I want only delete the first post and not the thread.You mean the old user created the thread and you deleted the thread.
The first post is the thread.
There are workarounds to change the first of a thread as mentioned. Including first moving the post into a new thread.
Deleting the first post always has and always will be equivalent to deleting a thread.