Developing C, JS/Node, Go, Python, and Ruby on Linux rocks. I liked it way better than using OS X, but then again, all of the apps I used were cross-platform. Is there anything on OS X-only that you think you'd miss? For example, you should definitely investigate any RDBMS GUI that you use on OS X, because there's nothing great in that area for Linux.

Audio production is... another matter. Linux certainly has hardware weaknesses, even in areas that have been massively improved (like GPU drivers). I've also done kernel upgrades that randomly broke drivers and had to revert. So honestly the audio/CNC/laser cutter/3D printer thing is much more iffy.

Consuming media through the laptop is another sticking point. I had tons of bizarre issues with Chrome/Firefox and streaming video sites. It was just a mess.

I'd be very wary of Arch, as well. If this is your primary work computer, I strongly suggest a distro with a well-funded corporate backer. Arch is also going to give you cutting-edge updates, but sometimes (theoretically) at the expense of breaking things.

Have you considered a Hackintosh? And what's keeping you off of Windows? Since Vagrant/Docker, developing on Windows doesn't require huge sacrifices, and driver/media support on Windows is better than any other OS.