Comment by ryandrake

Apple seems to like to coerce their users onto their preferred track little by little, release after release, instead of hamfistedly forcing it on day one. Instead, each release is a small drip of inconvenience and nudging.

Long time ago, you could run any executable you wanted. Then, you got a little nag, but whatever. Then (I think) you had to right click and take an extra step to run them, with a scary warning. Then, you got an even scarier warning and had to navigate into Settings to select "Allow applications downloaded from" -> Anywhere. Then, they removed the "Anywhere" option, but you could re-enable it with the command line.

It's also directionally clear: They surely intend to fully boil the frog one day and remove the ability to do this.

Se also: The UX you have to navigate in order to fill your own password into web pages on Safari.