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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.
The main downside is that dualboot doesn't reduce your computer annoyances in any way but adds additional computer annoyances. You still need to service your Windows installation but now you also need to service a whole other OS as well and the two fight occasionally.