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I helped build and calibrate XMM, earning my PhD https://www.researchgate.net/publication/252418991_The_X-ray... in the 90s, before leaving academia to start my first company.

I haven't kept track of the field. Has eROSITA reproduced most of XMM's data? I expect XMM will keep collecting data, but how useful/obsolete has it become?

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XMM is still extremely useful. There was a recent report that using clever techniques ESA are going to keep it going for another 10 years: https://www.esa.int/Enabling_Support/Operations/Teaching_an_...

XMM has a smaller field of view than eROSITA, but more light gathering capability (effective area), particularly at higher energies. It also has different types of instruments, such as the X-ray gratings.

eROSITA is really designed for doing surveys with its wide unobstructed field of view, and it will be doing just that for the next 3.5 yrs. We really need XMM to follow up in detail the most interesting sources we discover during the survey.

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