And why is that? For years, all we heard from Miguel de Icaza and the GNOME top table was "ISV, ISV, ISV!" We also heard it from other projects who favoured inferior permissive or weak-copyleft libraries to superior copyleft libraries (I'm thinking of OSAF's Chandler product) because of all the ISVs who would be building proprietary software on their work.
So why didn't all those people championing this lucrative ISV ecosystem get something done to make packaging and deployment easier? It's not as if those people had no skills, influence or money to do the work.