[plorkyeran]

"Games are presented as finished pieces" is an idea that's at least a decade out of date. The industry has gone very hard on the idea of Games as a Service and it's now normal for AAA games to receive years of content updates.

[aforwardslash]

From a software perspective, they are. Most games don't change requirements (or base code) during their maintenance releases, as these releases may fix some code bugs, more often than not provide only incremental updates on content. Compare that with eg. intermediate releases of software like OpenOffice.