Re: DTI: Forgotten History by C. L. Bennett Review Thread (Spoilers!)
In a franchise that includes rock creatures, shrinking people, hyper acceleration, faster than light travel, phasers, transporters, translators that can translate new languages instantly, aliens that mostly look like people, giant clones, cat people, shape shifters, energy creatures, cyborgs and so much more I just don't see the need to attempt to quantify time travel.
But there's no "need" to do anything. It's using that as a springboard to tell a story he thinks is worth telling, based upon premises he thinks makes the Star Trek Universe more enjoyable. And given how little you seem to actually know about the content of his books, I don't think you're really making an educated judgment here about how well that effort works.
"Every line of serious work that I have written since 1936 has been written, directly or indirectly, against totalitarianism and for democratic Socialism, as I understand it." - George Orwell, 1946