I really like the idea of a package/dependency manager. It just seems that when ever I am reading a tutorial and they want to import something that is not standard they say write this in to your TOMOL not cargo install it. Like when reading python docs they all say to use pip or something. Sorry it just seems that Cargo is somewhat overlooked or is it just my perception?
Manually editing the toml file and using cargo add accomplish the same thing, they both add the dependency to the toml file. Cargo add just tries to grab the latest version of a dependency it can and install it. If you manually add the dependency you still need to run cargo to actually install the dependency.