It saves a whole keypress (because you need to go into multicursor mode first, then press Home / Ctrl+A to get to the beginning of the line.

Additionally, there is a case where if you don't select the last line until the end, you end up in a state where the last cursor is already at the beginning. If you press "Home" now, you end up having that last cursor at the beginning of the line - and the other ones at the indentation level (see https://github.com/Microsoft/vscode/issues/14919#issuecommen...)

(Disclaimer: Author of the mentioned plugin, so I am heavily biased against my own workflow and saving-keypresses-obsession :P)

> What's this do differently from just pressing Home with multicursors?

Pressing home doesn't always put you at the true beginning of the line. It will put you at the first non-whitespace character.