This logic was found to be required for test conformance.

Currently, the server selector code does the equivalent of the old RSM implementation, which is:

• if tags are specified and minOpTime is in the readPreference, then try to only select servers that fit this requirement. Call this set S. If |S| == 0 then, ignore minOpTime in the readPref.

I suspect that, from the client's perspective, this has similar runtime characteristics as just ignoring the minOpTime altogether. We should validate whether this is true, and if so remove this logic.