I would agree with you if it was not at the cost of 2 talent points that will make you lose damage elsewhere. You are better off not taking it right now.
I think you lost the part where both spells are aoe range/spells that share a similar fantasy and just compete for doing the same thing. There is 0 reason for both to exist. The only reason for the bombs to exist was the argument that SV was a melee spec and should not have access to regular long range skills. Just have a better look at the tree and replace anywhere it says Wildfire Bomb with Explosive Shot, it all still makes sense while removing one button and keeping the rotation cleaner. You can also replace Explosive Shot with Wildfire Bomb, all the same.
Also design wise, it currently means that you have to pick a specific talent in the class tree in order to make some talents in the spec tree work at all. This is purely and simply bad design and therefore should never be a possiblity to take talent without having all the requirements to activate them as predecessor in the same tree.