Runar Jordahl explains why Smalltalk is the simpler, more maintainable choice:

For large projects where developers come and go, you can have little hope of always getting people that know all the details of the language used. There is for example no hope that universities will manage to fully teach students about complex type systems , iterators, generics, casting, etc. If you can choose a simpler language a lot of trouble will be avoided.

Follow the link for his example.

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