I'm not sure why "numerous cleanings" over the years would be disconcerting, as it would indicate that the watch was serviced regularly and taken care of. In any case, I don't believe the loss of plating indicates that, or that there were "harsh" cleanings.
The automatic system on these can come off as a unit, and it was sometimes swapped as a unit, so plating differences can be seen and are part of the normal life of a watch sometimes. In addition, I've seen many instances of Omega's plating just flaking off - not necessarily a sign of "numerous" and "harsh" cleanings, but just poor surface prep before plating.
If plating missing is bothersome to you from an aesthetic point of view, that's one thing. To indicate it is a sign of some other problem is not a conclusion I would immediately jump to.
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