So what's the point of a new building? Everything you pointed to in the article above would have happened with renovation.
This all started a decade or so ago with fans yelling "we need a basketball only facility" until—those that were paying attention realized—these fans had a NBA coach mentioning how good the practice facilities were for the team. So that reason is out.
We need fans closer to the court / it looks bad on TV. That's out, the renovation would have covered that reason.
The idea of "build a new arena because it'll improve the product" wasn't reasonable when it was first spoken. You're stating little belief it'll improve the HCA aspect: just aesthetics.
So what's the point?
Byrne suggested it was less expensive to dig down and then 'cover' versus building up and around. IF that's truly the case and it's all about cost, I get it. We're still left with what's essentially a city building and amphitheater in the park: it's only for show times.