I happen to love brutalist architecture, but in the uk it can sometimes not work (grey rainy days don’t bring out the best of the concrete). However, I think in this case it really works.
Concrete is strong and imposing and emotional. It feels authoritative and cold. A warm building feels like it has deliberately undermined its own status to feel welcoming and feels fake. A brutalist building doesn't lie. It is a massive concrete edifice containing a large space within.
It also weathers in distinctive ways. The water stains are like seniority, telling me the building has and will last forever. A big glass skyscraper feels replaceable and new, like it's disposable and will be replaced in a few years.
I get a lot of hate for this but one of the benefits of a concrete house is the ability to throw stones.
On a happy note, the incredibly ugly Argyle House in Edinburgh is going to be demolished soon - how anyone thought it was a good idea to build such a thing in that location is a mystery (its evil twin in the form of New St Andrews House having been demolished years ago).
The concert hall is good too.
Annoyingly, if you search for Anglia Square, most of the pictures are actually of adjacent Sovereign House. This is what I'm talking about: https://www.edp24.co.uk/resources/images/19194299.jpg/
If they could knock the flyover down too it would be a boon in my opinion.
Be prepared for every little bit of building work to take twice as long and cost twice as much now. The hands of future users are firmly bound.
Abolishing the listings mechanism in favor of an ad-hoc protection mechanism (when destruction is imminent) seems worse.