Metal vs mirror vs opaque modifiers

Dear all,

I was wondering in which cases is needed to use mirror or metal modifiers? the inputs are the same as for an opaque material. I mean, in terms of daylight if we need to replicate the mirror behaviour an opaque material with near 100% specular reflectance and 0 roughness will give us something like a mirror, the same applies for metal modifiers, I could use an opaque modifier to obtain the same result as with a metal modifier. Could somebody clarify this? it is quite confusing why there are these material options and when should be use.
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Thanks

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