During the next 15 years the area south of the station will be a much different place to what it is now.
A good station access makes the area more attractive to companies.
Yes indeed it will be different. Much of what is now used for employment will be swept away to make way for HS2.
Using the new exit requires the use of sets of escalators (Nothing wrong with that but from what I've seen, and on the video posted earlier, they seem to run constantly, rather than turn themselves onto standby when no-one is in the area. And, as on the video, when I used the entrance there were no other users in sight). You are then required to proceed through one of the tunnels under the station where you end up in Neville St in the dark arches, although admittedly near the southern end. The tunnels seem to be popular with the city's down and outs for sleeping and toilet purposes. I don't see that making an area attractive to companies.
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Which end?
However, is the east footbridge wheelchair accessible? If not then it might have been necessary to provide lifts to all platforms, as it's probably not acceptable to provide a new facility that can't be used by everyone (especially as the wheelchair route to the south side is even longer, not being able to use the steps by the cycle hub).
It was the end close to New Station St. If you come down the steps you will see it just to the right-it's a metal gate now. I don't see the wheelchair aspect being an issue-wheelchair users could still use this entrance to access the station although would have to use the existing lifts to reach the islands.
From what I've seen, the eastern footbridge can be very busy when trains are using the eastern platforms. Not everyone needs lifts/escalators. An exit there would be a useful time saver to many and a better use of staff time than the Southern entrance-although I accept that is now a fait accompli