True for so many things, but I don't think that applies here. Many of the npm alternatives are compatible or provide a superset - they have also helped to apply pressure to npm to improve, they are also not competing standards, but more like competing features and performance (implementation).
To put some technical context, it uses the same cache system as PNPM, using a shared store for packages, along with some more optimizations like per-package lockfile or manifest cache.
Any suggestions/issues or comments are welcome!