Understandable, yet there are already multiple residential towers within easy walking distance from the proposed location.
The area has recreational (Whitlam Leisure Centre, Woodward Park, Netball courts, Hiller Oval, Kyokushin Karate Budo Dojo), residential 15+ storey buildings (Liberty Tower, Latrel Estate, The Hoxton, multiple Aland projects), and commercial interests (Collingwood Hotel, Ambulance, City Band, Pathology, Girl Guides, Preschool, Autism Support, Meals on Wheels, Return and Earn, Liverpool Netball Association, Liverpool SES, Bottle shop, Car yards, Bob Jane, Petal polising, Life Long Memrobilia, Fast food, Car washes, Car hire, service station, and the list goes on) in the immediate surrounds, so a mixed zone would actually compliment the surrounding mix of residential, commercial and recreational facilities.
It would extend the city into surrounding areas, increasing access to facilities in that area, and improving access to further facilities for immediate and surrounding areas while providing more sorely needed high-density accommodation close to the city centre.
Doing so provides the benefit of increasing the city size without requiring extensive upgrades needed with low-density sprawl.
Liverpool Council appears to have lost the plot.