That feels like it's definitely a production/budget thing than anything else. Even mostly digital sets cost time & money to build, so they need to get the most use possible out of what they have. Not need to budget in even partial set construction time for a Star Destroyer bridge (even when they already have the digital assets from Kenobi ready to go) when they already went to the trouble of designing and building a very distinctive bridge set for the Eye of Sion that would serve the dramatic needs of the show just as well. Similarly; they made use of the fortress interior set for the briefing/meeting scenes as well as the fight scene. That's a prudent allocation of resources.Slightly related, I noticed that aside from the hangar deck, we don't see any of the Star Destroyer's interiors. Even when it comes time head back to the home galaxy, Thrawn assumes command on the giant hyperdrive ring's bridge rather than the SD's bridge.
Also; the Eye of Sion was where all the navigation and hyperdrive control was happening from anyway, so it makes sense that's where Thrawn would move his flag to. Plus in the event of an emergency it makes way more sense to cut the Chimaera loose and preserve the Sion than the other way around, so you don't want to be in the disposable ship if and when that happens.
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