Shutter ratings are pretty meaningless in my view. My old 5DS clocked up about 250,000 actuations in the 5 years that I owned it, and my 5DMkv is catching up fast, yet both of these have a quoted "play safe" expectancy of 100,000.
Realistically I suspect that the average true life expectancy of almost any modern shutter will exceed 200,000. How many people take more than 20,000 shots a year? Not many, I'd guess. So a shutter will likely last at least 10 years, by which time the camera will almost certainly have been discarded in favour of a "better" model.
With MILCs the situation becomes much more complex - e.g. does an manufacturer's expectation of "150,000" actuations refer to mechanical shutter (open for viewing, then close, then open to begin exposure, then close to end exposure, then re-open for viewing), or to EFCS (open for viewing and start of exposure, close to end exposure, then reopen for viewing)?
Shutter life expectancy will also vary hugely from one user to another, depending on frame speeds chosen, degree of vibration that the camera is subjected to during transportation etc).
.... and with the advent of the Nikon Z9, I think we can expect most future cameras to completely dispense with mechanical and EFCS shutters, at which point the life expectancy of the shutter will basically equal the life expectancy of the sensor and processor (whichever dies first).