The first commercial space station, Haven-1, is now undergoing assembly for launch

"We have a very strong incentive to send a crew as quickly as we can safely do so."

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[Bill Swallow]

Space is at a premium and the floor, walls, and ceiling, are all interchangeable, so any partition wall is going to be supporting equipment racks. The part about support columns was addressing @Randomizer's bulkhead argument.

... You know this is in microgravity, right? Equipment racks won't need to be "supported" so much as "secured".

 

[Bill Swallow]

Just spitballing here, but there may be an upside to killing off all of the fungi & bacteria that have colonized and evolved on the station for several decades.

"I must keel eet before eet develops language skills!" -- Ambassador Londo Mollari

 

[Bill Swallow]

While a rotating station would make it easier to walk around, use a toilet or shower like a normal person, it would be extreme difficult to work outside of it, as the centrifugal forces would tend to throw the astronauts away. And you would need a non-rotating portion of the station to do any kind of space or ground observation since your orientation does a 360 every four minutes (or is it one-fourth of a minute).

Heinlein's short story, "Ordeal in Space" (1948), covers this quite well. And while the need for a non-rotating section greatly complicates matters, there are conceptually multiple ways to deal with the problem. '2001: A Space Odyssey' and 'Babylon 5' show two approaches.

Alas, it's going to be a while before our engineering catches up with our imagination.