And even within a single publisher, there's no strict requirement that separate works must be in continuity with each other. For instance, the Crucible trilogy and the Shatnerverse books both have continuity differences from the majority of books published these days. Consistency with onscreen Trek is a requirement for all tie-ins, but consistency with other tie-ins is merely an option.
Destroying the Earth is a plot point that deserves to have other novels be deliberately INconsistent with.
Am I overreacting? Hell yeah - it's what I do best! Why shouldn't I?