To remove the noise you have play with these settings:
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What’s the idea about fresnel mixing in additional glossy to the glass? A glass shader already fresnel mixes refraction with glossy.
I’d never do this in Cycles, and although I know Eevee fakes it, I’m not grasping the why of it all.
So it acts like a magnifying glass, I don’t know exactly how it works but it works.
Actually you are right. It’s just an habit to do so. The fresnel with glossy is to enhance the reflection if you need it. Depends on what you want it to look like.