Firstly, please remember that these stats are what exist as she ENTERS testing. Testing can be a wild ride for a ship and see massive swings and changes depending on how she plays out in actual situations.
The reason Test Ships aren't talked about on stream is because what can be extremely X one day can become extremely Y within the span of a Day. Please wait for the finished product before passing final judgement.
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Some things worth noting even at this early stage.
San Diego has a faster rudder by a second, a 9.2km Concealment when fully built for it, more AA in her mid/short ranges than an Atlanta has (which absolutely matters when she utilizes smoke/teamwork), and -16km range-.
1) Will she hit things at 16km? Depends on the player, and also depends on what testing data shows. If tweaks are needed, testing periods allow for tweaks.
2) 9.2km is terrifying when you have MBRB-boosted SAP tearing apart an enemy DD if you choose to close-support a friendly DD by either hiding just behind their Detection Front or in a smoke they've left (teamwork ftw). The Austin is similarly horrifying when a DD finds out that they are WAY TOO CLOSE to a SAP slinging monster using their MBRB.
3) 150 base AA dps out to 5.8 multiplies quickly. +50% from Defensive Fire. +50% from Priority Sector (+75% if spec'd). That quickly becomes either 337.5dps from 3.5-5.8km or as much as 496.12dps if spec'd and flagged. That's just the LONG RANGE. There's mid and short range as well (which the Atlanta does not boast to the same degree).
Further, San Diego runs a base 7 Flak, which goes to 8 with the Priority Sector skill... 8 Flak is enough for mid-point saturation and to start spilling over to sides, ESPECIALLY when assisted with other friendly Flak that further fills in holes.
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I understand concern, but please keep perspective on a ship that hasn't even entered Testing yet.