Howdy! 
As an average developer and as development goes by, it is impossible and very difficult to scale/grow a truss in any direction whether it is on the Y axis or the Z / X axis whenever you’re trying to scale a truss when working with that.
Anyway, the current truss is pretty nice overall but it lacks a lot of features and additions that it needs to be much more of a “truss” as the truss is pretty much useless when scaling more than the maximum size, unioning them together and having to grow from any sort of axis. However, they’re some alternatives and workarounds with these which is duplicating and sorting them out from any direction or way the truss is facing or pointing towards, making us developers and users easy to do this but it takes up a lot of space and possibly voxels (if it does affect it if I recall correctly) and valuable memory if you use truss’ often inside your games.
Alternatives + Worksarounds:
However, at the same time, scaling behaves like moving a part/truss around with the Move tool, not the best experience if you ask me:
Videos:
Although, main point of this topic and why it was created is due to the fact that having it not behave like a truss and more of a ladder/decoration; having it grow from whatever endpoints is a struggle at the moment and it should actually grow like parts and meshes and not move as it behaves at the moment.
Images that I would like trusses’ to behave when scaling on the X, Y, and Z axis.
^ Same images as the previous one above, but what it could look like using only one truss instead of duplicates.
Many of us might ask: Why not just use blender? Problem is that some users might not want to use blender because they don’t know how to do mesh making and all of that or just dislike using it.
If Roblox is able to address this feature, I wouldn’t be able to have truss issues and improving my development experience by a lot, because I would be able to not use more than two trusses’ as an alternative and workaround to create a giant truss wall, ladders and possibly one single truss to make something that has to use either 8 or 12 truss instances.