defstructs and packages

Why CL includes two non-orthogonal concepts for code organization? Why to define an IMAGE package I have to separately declare (defstruct image-state ...)?

Can we replace defstructs with packages in future Lisps?

>>10
Use C# then if that's what you need. Nobody prevents you from making a "safe-CL", actually I think AllegroCL or one of those commercial lisps attempted something of that sort.