While I understand the utility of a USB installer, it should be mentioned that macOS Internet recovery has been around since Lion. You can choose to install latest ...

macOS Monterey version 12 is a stable, lightweight upgrade that works great on older Macs, and you can use the direct DMG or ISO links to download, install, upgrade, or downgrade your system easily.

PSA: for MOST use cases there is now a much easier solution. If your primary goal is just to download updates faster/not use up your limited data budget, and you have multiple Macs (otherwise why do ...