Not necessarily, people don’t travel through time in Dune but they do see through time, and Spice specifically enables humans to see the past and future. I can theorize that actually traveling into the past is something only intelligent machines were able to facilitate. It could also be a situation where the high tech solution (lasers) has already been countered (shields) so the low tech solution (swords) becomes the better weapon. It could also be by a mutual agreement, or simply lost tech.
I have an irrational dislike of her voice and the way she talks but nothing against her as a person or a professional.