I think the Smalltalk problem is that it is too different. You cannot integrate its features one by one into your workflow, but you basically have to change eve

I think the Smalltalk problem is that it is too different. You cannot integrate its features one by one into your workflow, but you basically have to change everything. Porting the features one by one takes a long time and sometimes the benefit seems to be low, because it only provides synergistic effects together with other features. Another example is Plan9. Some of its innovations were ported (/proc, utf8, ...), but some things probably never will (everything is a file).