Maybe the reason is to see what options are available that suit their style and if they like the chess themes around that very opening.
I think this is really a major stumbling block for novices. They are so interested in learning something that fits their "style" that they don't really realise they aren't good enough to have a real style yet.
Many people like the idea of a swashbuckling style, or of a quiet positional style, but do not realise that in the former case, it involves recognising the difference between gambitting material for development and just dropping pawns in the opening. In the latter case, to play good positional chess, one must be able to work out their opponent's tactics.
So in both cases, in order to play well, a person must understand both tactics and positional chess! "Style" only comes into the equation once a person has mastered the basics (perhaps +1700, or even higher).
Well with so many variations in the opening tree, i don't think i want to study them all. LOL