I don't remember if my mind is recollecting this from a livestream or some Dev comment on an old thread, but it was my understanding that the idea of adding the Housing carry-all kind of came with the idea of making it possible inside the carry-all for the same items to stack (provided their binding status).
@Elmagor: I personally have more than 1 of the same, yes, including doormats, because I decorate more than one house and because I never know when I'm going to want a duplicate to have a symmetrical decoration. Of course if this is something you don't do in LOTRO, you wouldn't imagine it.
Nevertheless, I doubt I'll choose the Housing one just because I consider Essences/Crafting/Tasks a higher priority clutter on the toons I enjoy playing... while decorations are in my decoration toon mules.
In any case, we have 3 options:
1) a Dev gracefully comes to clarify how Housing/Instruments will work.
2) we wait for May 1st and our friends from
Deco du Milieu will surely update us on how [at least the Housing one] works.
3) someone from BR comes & tells us... I totally skipped the carry alls coz I found out about them after BR closed and we only got 1 build.