I disagree: Common Lisp has many remaining powerful features AND a large set of them, when a language maybe caught up with one. The interactive debugger is unmatched, image-based development nearly doesn't exist elsewhere, the condition system… Example: fix a bug without quitting the debugger, re-compile the fixed function with one keystroke (instant feedback), go back to the debugger, choose a stack frame to resume execution from, see the execution pass. You didn't re-run everything from zero.

SBCL has pretty good type inference at a keytstroke (not complete, but useful, for a Haskell on top of CL see Coalton), it's fast, different implementations, stability…