Brew is installed by copying a command line-
I mean, I guess you could retype it, but there is no intention for anyone to do that.
But it was held as something exceptional, when here in reality a number of extremely widely used products, frameworks and tools provide installation through a curled shell script command.
Another example is CUDA on Linux. Installed via some copy/pasted scripts from a webpage.
I fully agree, this seems to be becoming more and more common unfortunately.