Depends on what you're doing. For example, compiling is multi-core, but linking is normally single-core. Many workloads are still heavily single-core-dependent, so great single-core performance is still a big asset.
GNU gold was doing threaded linking 15 years ago, and nowadays threaded linking is the default for new linkers like LLVM's lld. Unless you use very specific GNU linker hacks, there aren't any reason to not use lld, it works fine for linking large software like LLVM/Clang, Qt, ffmpeg...
