I think it depends on the feel of different parts of your track. For mellow, relaxed and peaceful stuff like Tycho's, having a sphere of white noise in the track does the right thing. Sometimes, though, it doesn't really fit. Especially when you really want to stress a certain element in your arrangement, whether it's a vocal part or the first bars of the drop. I think the best way to find out when it's beneficial and when it isn't is too experiment. It definitely connects to the track's mood and energy.

the feels ! if the white noise is added on big room tracks, it'll create an impactful effect
if it's on something like tycho, probably for that old feeling or something

White noise will fill out the really high frequencies (10k and higher) in the frequency spectrum which will make the song feel really 'bright'. It is very commonly used in progressive house [Dubvision, Volt and State, Stadiumx and so on]. You can try a fun experiment and import a few tracks where you can hear white noise into your DAW, then, sweep with an eq and try to find a place where you can hear white noise the most. After that try pulling it down a few dB and then do an A/B test. You will notice that even with just 2 - 3 dB reduction, the song won't feel as bright.

Some artists use rides playing together with each kick instead of white noise. For example Stadiumx use 4/4 ride in most of their tracks to fill out the really high frequencies. Other artists might just use white noise but it's purpose is pretty much the same.

White noise effects like sweeps, crashes and impacts are pretty self explanatory.

Some synths, like sylenth, can have pretty harsh high frequencies that don't sound too great.  Seriously, anybody just go ahead and play the init preset from sylenth and focus on the high frequencies... you might start squinting.  So cutting those and replacing them with a white noise can help clean up the sound and make everything sound a bit cleaner and more straight forward.  The Only Way Is Up by Martin Garrix & Tiesto is a good example of a track that utilizes white noise as the high frequency filler.  Audien also gave this tip in his video where he talked about creating the synths in his track Wayfarer. 

I think the most important mixing strategies to use when using white noise are:
1. High pass! I think a high frequency, hiss-ey white noise sounds best... theres a lot of mid and low in a white noise oscillator that can sound cluttered in a mix.
2. Level it as best you can! Sometimes you can get away with the white noise sounding very present in the song (i.e. the track I mentioned) but usually if it's leveled out evenly with the synths, it'll sort of blend in and help fill out the sound without being too overbearing.

It's a decoy for poor sound design and composition.

Although it can be handy with some tunes if you replace WN with crowd noises.