This is the minor version component paired with tsiT2SMainSoftwareVersion, together forming the T2S controller's full version identifier in a script-friendly numeric form rather than requiring string parsing. It matters for distinguishing between firmware releases that share the same major version but differ in minor patch level, which might matter for a specific bug fix an admin is checking for. An admin confirming a specific patch has been applied would check that both this minor version and the major version match the expected released firmware exactly, not just the major number alone.