I've dual booted, even triple-booted in the past and found out that by and large, the concept doesn't work.

You always need the OS that you are not booted into.

Or you are having issues with one and you need to use the other one. Plus Linux is designed to stay up, or you are doing something that prevents the machine from being shut down.

I stopped fighting and got a second notebook, the identical MSI GT80 Titan I already had. One will run Win10, the other RH8.

Plus if I have a hardware failure, all I have to do is swap the SSD into the working machine so it's nice to have redundancy.

I have always kept my old systems when I get a new one. Mighty handy - I often have 2 or 3 laptops going whilst watching the footy on TV.
Mind you, they are all multi-boot ... :shrug:

I've been using Linux full time since 1999, (with the occasional BSD), it's all I have on any of my machines, who needs two operating systems!

Linux is a kernel, not an operating system.

Yeah, I used to have Windows and Linux on the same computer. Later, found that it was less hassle to have Windows and Linux on separate machines. Then I realized I was booting up the Windows computer only to update the system, so I dumped Windows and it's been Linux-only at home ever since.

Fixed that for the nitpickers.

I used to have several Linux systems, but I've now more or less standardised on Slackware. There are other systems on my machine (an old LFS, a hard-drive version of SystemRescue, a trial of OpenBSD which I installed out of curiosity but probably won't take any further, and a version of Bodhi that I'm using to fix some documentation for the devs) but Slack is practically the only thing I use from day to day. I'll probably still build LFS when a new version comes out, just to prove to myself that I still can, but I don't feel I want another full-scale operating system with all the applications. I just don't have the energy for that any more.

Each to their own - I gave up on Slack years ago. Means didly squat to others.

I don't own or have an install of Windows, don't need it. I have 3 computers: a new MacBook Pro for anything commercial I need to run, my Debian box used as my main PC and a FreeBSD server on my HP z800. I don't dual boot to any other Linux distro because I don't see any point. If I want to experiment, I use a VM. Frankly I wish I only had my main PC and my MacBook - I really have no need for my z800 but since it's 10 years old, no one really wants it.

I give my old computers away for free, someone always takes them.

Where I live, there's an unspoken convention that anything you find beside someone's front gate is waiting for someone else to take it away. I've picked up a lot of equipment that way.

Businesses here don't get rid of their computers after 5 years like they once did. When the service contract expired they tossed them. You can still find a few though. In 2005 you could get 10's of them for free.

I agree with OP. Main machine for Linux, older machine in the corner with some flavor of windows just in case. I don't even have that anymore. I do have a hard drive on the shelf with Win7 on it. Guess I need to update to Win10. I really don't like it though.

Anybody with a garmin satnav

I no longer have a Windows machine (thanks to a nearby lightning strike), but I do have a legitimate and registered Win8 VM, just to keep my hand in and in case I need Windows for something unexpected.

I haven't used Windows for any sort of productivity (either professional or personal) in a long, long time, other than running for U. S. income tax software.

When I did have a Windows box (a 23' Lenovo graphics tablet that I received as a gift), I dual-booted it with Mint and then with Mageia just for the heck of it--it was too nice just to waste on Windows.

Before that, my only experience with dual-booting was with Slackware and Fedora, just because I wanted the experience.

^ +1 for vm.
This made me laugh out loud!
I can imagine a comic strip: 2 computers sitting side by side, one running Linux, the other Windows, and lightning striking only the Windows machine!