By the time you unlock Tenebrium/Respec, you only have about 20 ability points, and Marksman 5 already requires 15, so investing into Bow is just a waste.
You will miss out on a bit of damage early on, but won't have to respec your char.
With the high initiative it is useful to have access to some low level buff spells, so that you can kill stuff before your opponents get to move.
