Titles between square brackets are only when the track has no title printed on package and we make up a title like [intro], [silence], [outro], [staff roll], etc.
When there are titles printed on the package or booklet, etc. and they are called Intro, Silence, Outro, Staff Roll, in that case no square brackets as they are not made up by us.
Same with Various Artists, IMO, I think it’s strange to not have it as [various artists] as I never saw it printed on my VA/Omnibus releases.