The first thing to remember is that B&W film is not equally sensitive to all wavelengths of light, and the wavelength sensitivity of films varies quite a lot. There is a convenient graphic showing a bunch of film spectral sensitivities at www.linabessonova.photography/spectral-sensitivity showing how much they vary. The amount of silver in an area of film is not just a measure of light intensity, and a B&W film image is also a record of the colour of the light.

The same is true of digital sensors. Silicon is not equally sensitive to all wavelengths, so the voltage output of a monochrome photosite is not just a measure of light intensity - it also varies with the colour of the light (micromagnet.fsu.edu/primer/digitalimaging/digitalimagingdetectors.html). In a monochrome sensor you don't know how colour and brightness combine to determine a photosite's output, but if you have the Bayer filters you do know the colour of the light each photosite saw so you can adjust for the spectral response and reconstruct the luminance information more accurately.

You do get a small increase in resolution by getting rid of the Bayer mosaic. That may have been worthwhile when we had 6MP sensors, but until someone invents a higher resolution printer it doesn't make any difference with modern sensors.

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A nice pattern made by a leaf miner. The mine has little frass (=faeces) which, together with knowledge of the host plant, might allow identification of the mining insect.

This is another winding path on an orange leaf; they're quite curious, actually. I see them while taking macro photos. The sand you see on the leaf is Saharan sand; the southerly winds of the last few days have carried sand from the African desert to Murcia.

"Discover Norway  by Train"

 My fellow train traveller kept this posture for the entire 2 hours ride

I also like shooting monochrome. Ilford HP5 used to be my standard. With the Zf, I have the possibility to view B&W which I think inspiring. B&W conversion in PP looks satisfactory, not only with the Zf but also the D800 I used before. SilverEfex is also a useful add-on when one lacks inspiration or time.

Having a monochrome sensor would not add much where (in my case at least) more serious practice should come first.

However, If could swap a conventional sensor for a B&W IR sensor as easily as changing film, I'd be happy.