While part of me agrees, I will say most ecosystems have some glaring flaws in them. Python's lack of lock files in particular is something that annoys me to no end. Having to use poetry, pipenv, or whatever else people are using now to get around it sucks. Python's lack of being able to use multiple versions of the same library is also a thing... but not something I've found issues with personally.

I'm not going to say cargo is some mind blowing system cause I really don't think it's innovative, at all - but I do think it's far better than most ecosystems just due to benefits of hindsight. Having an opinionated, simple build system that does all the right things out of the box is valuable, and I can't think of any mainstream language that really hits that mark otherwise.