The louder the fans, the more I'd want them on all the time. Reason? The brain eventually tunes the sound out if ever-present. Switching on and off, the sound would bother my much more.
Also, it's possible to have no screws holding the top piece of the base casing on, and remove it when the wheel's in use. It sits fairly neatly back on when not in use. It's quite a confined little space in there, so it needs all the help it can get for it's futile attempts to stave off heat build up. Be aware that as it heats up your ffb will fade, so we're talking about performance as well as reliability here.
If you do open it up, use an angled screwdriver to get to the awkwardly positioned screw just behind the wheel rim. Saves you taking off the whole wheel in the way that Youtube guides suggest. Also worth seeing if you can thin out some of the usually excessive and claggy lubes they use, once open. This will help with drag levels, which will help heat levels, which will help ffb fade time, and also help the ffb feel more detailed and informative.