Not really, multi-threaded parallelism is still limited by the GIL and it is best to use multiple processes instead. Unless you are using threads for I/O, or anything not using the CPU.

What has changed since then is that Python now supports single-threaded concurrency, through async-await semantics.

Adding threading to a dynamic scripting language that had a multi-decade run as a single-threaded runtime turns out to be really, really difficult, especially if the language had C extensions. They all have had one form or another of very hard time about it, because it is a legitimately difficult problem.