What dev system allows you to build things without downloading required components first? None? Like every other dev system, connect, either download offline i

What dev system allows you to build things without downloading required components first? None? Like every other dev system, connect, either download offline installers for everything (they exist), or get your system running, then you can dev offline all you like. You don't need to "be connected to the internet at all times for any reason whatsoever". You need it once.