Hello,
is this a new thing, or I'm just misremembering, has the web forum always been displayed in tables?
Like it is now with forums listing and topics listing?
One practical disadvantage is, that Orca now says "Row header" on literally every heading before its content, what makes it quite difficult to navigate around.
One approach is to just find the first heading and use table navigation afterwards, that works fine, except Alt+Shift+Arrows is a more complex shortcut than H/Shift+H, meaning more finger stretching.
I certainly do remember there weren't these messages about row headers before, so either the forum or Orca had to change at some point.

hello,
nothing have changed on the forum, this is like this from the begining, so sadly this is something that changed in orca.