THE BOTTOM LINE:
County Commissioner Offices are primarily responsible for the public roads, bridges, parks, and community centers that are not within city jurisdictions. (Areas not within city jurisdictions are referred to as "unincorporated.")
In order to do work outside of county-maintained areas, Commissioners' Offices partner with local cities, HOAs, MUDs, schools, and other entities. There is a formal agreement and contribution from all parties involved.
If Ellis's plan passes, the majority of unincorporated Harris County will be the responsibility of Precinct 4.
Although they would bear the majority of the maintenance, funding will be limited, which means infrastructure maintenance and programs will suffer, and voices will not be heard.
If one precinct fails, the entire county fails.