Sounds like a great idea, like @rknLA, I'm constantly torn to keep up to date for development purposes, then concerned its going to break my music setup.
of course, the cost is, maintaining 2 OSs ... and also you'll have to watch for number license activations on some software - unless they see it as the same machines?!
I wonder about a couple of other alternatives:
- External SSD with USB 3.x , should be fast enough for most use cases?! anyone tried?
- Virtual Machines - have multiple setups running on something like VMWare?
it may not get you 100% the same performance as a native dual boot, but on a modern machine, I suspect performance would be very good... and might make maintenance easier (e.g. cloning) , vm's also support snapshots, so can try things out, and rollback.