For an example (albeit on a much smaller scale) of this problem look at C# and the .Net framework. While the language supports generic types and lambdas for quite some time, there's still a helluvalot of APIs designed for the older versions. Whole frameworks with tens of custom collections each one slightly different and neither supporting type inference in enumeration and LINQ, APIs forcing you do implement over-complicated interfaces and wrapper classes where a simple lambda would do, APIs designed so that they in effect turn the whole type system off, because before the introduction of generics there was no other way, ...
Some of those APIs are deprecated, some of them should be (eg. the whole of ASP.Net Web Forms and the insane mess that's LLBLBLBLBBLLBLLGen), some are still being used, all are painful.
In either case if you feel like trying Scala, do.
Enoch was right!
Enjoy the last years of Rome.
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