Not OP, and this is only one aspect to consider, but it's from experience - when generics were added to C# the language became nicer to use, but it caused a lot

Not OP, and this is only one aspect to consider, but it's from experience - when generics were added to C# the language became nicer to use, but it caused a lot of churn and added complexity. The base libraries have the original non-generic classes as well as newer generic ones. As I've written above, there's huge potential to be the language that doesn't churn, when just about everything else does these days.