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Binning on the mono IMX455-based cameras like the QHY600 (the bigger mono cousin on the IMX571), does provide most of the benefits of CCD binning. The reason it works is fairly technical and involves removal of correlated noise -- the read noise in a 2x2 block is exactly that. The reason it doesn't work on an OSC camera is that you have a Bayer matrix there so a proper 2x2 block isn't meaningful. It has to be something that takes into account the Bayer pattern and by then, the photosites are no longer nearby each other to take advantage of that correlated structure.
The whole OSC versus mono debate is pretty huge. While almost any tool will recover most of the lost resolution, it still doesn't address a few of OSC weakness: you have twice the green sensitivity as red and blue, you cannot easily do narrowband imaging without expensive dual and triband filters, your overall camera sensitivity is lower with and without these special filters. Especially in light-polluted areas, being able to image in narrowband is a huge advantage. OSC is generally more convenient, however.
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