Given that Floor Space / Volume is at a premium on a StarShip, why would you want to make inefficient Cut-outs in your StarShip unless it serves a technical purpose?I'm too old school for all these new designs.
I can live with an occasional weirdly placed 'hole' but the disconnected/floating parts just looks stupid to me.
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As for the modular / floating Warp Nacelles, I can find tactical use for that mid combat or out in the field.
If 1x of your Warp Nacelles is damaged, imagine an ally bringing you a replacement unit to attach to your pylon.
Real Time Swapping of Warp Nacelles in minutes, instead of depending on a Tow to drag your StarShip back to a Repair facility.
Or lets say you need to get back out into the field ASAP because of mission critical readiness and you're near your StarBase.
Having a quick swap Warp Nacelle would be a nice way to get back to FTL readiness.
A damaged Warp Nacelle can be repaired at base while a fresh new unit can be ready to go in minutes.
Having your Warp Nacelle be Floating for the sake of it doesn't make much logical sense.
StarFleet vessels are already pretty damn manueverable at SubLight.
And having to replicate an entire WarpCore System in each Warp Nacelle seems like a wasteful use of resources and only increases mass & complicating designs.
Ergo Warp Nacelles attaching back to the Pylon to get access to the Electro Plasma feeds to power the Warp Drive makes ALOT more logical sense.