It would be really interesting to see specific examples for this - can you give a short example in code or pseudo-code of somewhere you really wanted them and didn't have them, and how they would improve things? There is a generic append, but do you mean sorting lists or something else? Apologies if this is obvious, but it would be enlightening for those not familiar with generics from other languages.
If you want to create a []MyString from []string, now you have to loop over that and transform by hand, with generics you could do map(NewMyString, a).