The author can be forgiven for continuing the use of a gun form factor. An awful lot of SF carries that even into the far future.
I do think we'd see more integrated aiming, shoot where your eyes point, and it might as well be a beanie-cap weapon (or Predator-style shoulder-mount) because space combat encourages non-kinetic anti-personnel weapons. It might even be more likely we'd depend on separate personal defense drones (ala Iain Banks Culture novels) or dog-like weapon constructs. Taken in another direction, if nanotechnology grows we might 'wear' an adaptable field of microscopic devices or simply release the stopper on a tube to release them.
No comment on Xanthe's quoted text. It, um, speaks for itself.