If the ship is using its increased size for say, better liveability for the crew on long journeys, more stores, more cooling equipment for the radar, more electronics and computing back end, and for some other things, yes, a ship would sacrifice VLS for other things. After all, the Zumwalt despite its displacement, only has 70 VLS. If you look at the upcoming German MKS 180 surface combatant, that would displace 10,000 or even 11,000 tons, yet it only has 64 VLS and half of them will use ESSM, not in quads, but in singles.
It has no technology that will not have been tested on previous ships. The radars will be from the DDG-51 FIII family of GaN radars. Electric propulsion tested on the Zumwalt and the frigate Constellation. It is a natural evolution of the future great combatants of the US Navy.
In the NAVSEA file it says that 32 silos can be exchanged for 12 larger silos to fit the hypersonic missiles, it doesn't say there are 32 cells ahead. For now there is a lot of speculation about the total number of silos. The US Navy has already said it wants at least the same 96 silos as the Arleigh Burkes.
One possibility is that the forward silo group may have 64 silos and the midship group
among the chimneys, another 64, totaling 128 silos, the same number as a “Ticonderoga” that, due to 2 built-in cranes for remunication on the high seas, resulted in the loss of 6 silos.
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All that you say doesn't make any sense when analyzing the ship's displacement and the total combat capability of the DD(X). Everything indicates that it will displace more than a “Ticonderoga” and “Arleigh Burke III”, both in the range of 9600 tons loaded, however, less than a “Zumwalt” of about 15,000 loaded, it is speculated something in the range of 12,000 to 13,000 tons loaded. The future DDG, if it actually follows the specifications presented, will have a displacement of about 13,000 tons also due to the greater inclusion of steel in the construction, but, there will not be a significant increase in armament, the number of silos should be between 96 and 128 and a second main cannon will be exchanged for other guns and stuff like that.