The Liver building was the skyscraper of its day. Roundly condemned by some traditionalists at the time. Cities need vibrancy. For that, they need density. A cluster of towers can help provide and concentrate that. Liverpool waters obviously contains several bodies of water, which will not be occupied.... therefore to maximise density, the developments along the Quaysides need height to be sustainable and to spread activity along the waterfront. Nowhere can sell tall buildings better than a port city's waterfront. If it can help attract investment and new businesses/jobs, we should maximising that opportunity. We did Half-hearted low rise on the south docks, it's pleasant enough, but hardly a massive wealth/job generator.