I plan to do a pc upgrade very soon. Alongside that I plan to start with Mint or Fedora. Is there any real or big downsides to dual booting ? Aside from the harddrive space lost ?
If I like or really like my time with Mint I would probably switch permanently but I felt like I wanted to test it for a couple of months before making a complete switch.
Im a big 
so that impacts my consideration. Dont really play much multiplayer shooters so I dont have a problem with kernel anticheat games not working.
My only problem was caused by windows bullshit. I tried the Bf6 open beta and had to turn on secureboot. It fucked with my graphics card drivers and once I turned it off I had to switch the drivers around again to get good performance on Linux again.
Otherwise, most things Just Work between Steam and other launchers. I've noticed some things like worse performance on Nightreign and screen tearing in Silksong even though it has a native Linux version. But otherwise it has been all good.