This is overall an ineffective means to do it however, not only because of CPU issues (RX Spectral De-Noise is a huge CPU hog because of how good it is) but also because it's just not as good as attacking it from the source. RX can remove a good amount of the noise but it will almost always affect the sound negatively (I use RX Spectral De-Noise all of the time and it's never as good-sounding when it's on, but I'm a stickler for details so what I can say). RX -- even though it's an extremely great and useful tool -- does not do the job as well that should be done from the source and/or recorded in a way that doesn't induce as much noise. "They do noise reduction but too much yields that hollowish sound" was said above, and he's totally right.I do believe The reason why this type of hissing noise or for that matter any type of noise does not bother composers or mixers of today is because of the noise removal tools that are available to use
Even if you have a very noisy sample in your mind its as if its not there because of these tools, izotope RX.
To day yes we can do anything so bring as much noisy samples as you like and I will just slap a noise removing tool and remove it 100%
a lot of noise is left alone as it does remind us that humans are playing the instruments and gives an organic effect that is very appealing most of the time.
Bottom line is noise should not bother any mixer or composer in any way, we just simply have a million tools at our hands to put things right or the way we want to hear our music we are drowning in make it good tools.
There are major libraries that don't have this excessive noise issue, so I know it can be done.