A number of drivers support the connectTimeoutMS URI option. The introduction of serverSelectionTimeoutMS seems to make this far less of a useful user facing option. We still need a select timeout for making an initial socket.connect() call, but from a driver behavior perspective serverSelectionTimeoutMS will always appear to dominate (at least for multi-threaded languages). Should we deprecate connectTimeoutMS?

See PYTHON-908 for a related discussion.