To respond to the original question, the main STA campaign I played didn’t use deck plans, or an MSD. I suppose we relied more heavily on ‘theater of the mind’ type play than other groups might, though. I did start making an MSD and deck plans (we had a Nova class, so it was small enough) that our GM used for reference, since it helped ground things on board the ship, but it wasn’t essential and was never used as an actual image in gameplay.
The part that was used the most was the deck listing, which was mostly based on Memory Alpha’s deck listing for a Nova class. I think that’s probably the most relevant and least-work-intensive item, but even that could be subject to change based on the talents a ship has. An MSD would also be super duper cool, but again, might have some of the specifics change based on talents.
I think there are some issues with creating deck plans. The first being, as @BrianDavion notes, plans made for a “cool” factor that don’t take into account “real-world” considerations may be seen as insufficient for some players (“real-world” here meaning the physical logistics that we see on shows and that officially released plans have shown, as opposed to just lines for walls in important areas. The Ed Whitefire Enterprise-D plans are an especially good reference for this, as they include the physical “keel”-type bulkheads and structural elements).
The other being that many existing deck plans or info on ships carry forward things that are not official or don’t quite make sense. A Call to Duty is a cool site, to be sure, but there’s been several things on there (I can’t think of examples right now) that I find questionable in terms of how we saw the ship work, or that were clearly just made up to fill out a ship’s specs. And the Nova deck plans linked above use the extrapolated size from angled shots of the ship next to Voyager, or the MSD (which should rarely be used for scale), but Rick Sternbach has noted the drawings he made were sized significantly larger, and the Eaglemoss model used his size as the official size. Given that STA pulls much of its lore from beta canon and similar sources, I would be concerned about things like that getting pulled forward to STA plans.
So if Modiphius were to create plans, it would be a lot of work with a lot of potential for dissatisfied people, and I’m not sure how many would even be purchased. I’m sure that there’s a reasonable market for general collectors of licensed deck plans, but I suspect many wouldn’t be purchased unless a table needed a specific ship’s items.
(In case anyone wants to see the incomplete Nova-class stuff I made: https://keithblumenfeld.com/afop/scorpiimsd/. And as long as I’m showing my art, proof I can make a complete MSD: https://keithblumenfeld.com/bajormsd/)