Scheme would be a better example.

Yes it does. It has at least 4 different ways to loop, 4 different types of arguments to functions, 5 or 6 different lets (functions, macros, let* , normal let, ...), 3 or 4 different kinds of variables (with no unifying underlying theme), and at least 3 different flow models (the nested lists, tagbodies, loops with returns, etc...). That is exactly the same problem with C++. Instead of finding unifying abstractions which give the same functionality with 1 idea, they have chosen to add in multiple specific quick fixes to the language. They have chosen to amend the language with a thousand small changes, each suited to its own little use case, and have ended up with a monster of a standard that takes up 15 megabytes in 2300 files with 110,000 hyperlinks. Thats 15 mega bytes mostly of text.

Scheme is a lot better but its going the way of CL, slowly but surely.