If Labour were benefitting from this more than other parties then that is irrelevant.
Labour will not benefit from the boundary review - they will lose out. But that's not my problem with it. Local authorities have been steadily downgraded and stripped of their powers and responsibilities for thirty years or more, as central government has grabbed ever more control. Removing the link between local and national government can only weaken local government even more than it is now. Maybe that's why the government is doing it.......
The present Hazel Grove constituency consist of six Stockport wards: Bredbury and Woodley, Bredbury Green and Romiley, Hazel Grove, Marple North, Marple South, and Offerton. The eighteen councillors for these wards can be (and are) in frequent touch with our MP over matters of mutual local interest and concern, and I believe this works well.
If Marple, Romiley and Hyde are forced together in this shotgun marriage, the Stockport issues will be quite different from the Tameside issues, and that can only impede teamwork and a sense of community and common purpose. The Romans called it 'divide and rule.'
PR would eliminate democracy at a stroke.
Many other countries have PR (most EU countries , Norway, Switzerland, New Zealand etc etc) and many of these are, if anything, more (not less) democratic than the UK.