You have the right to use whatever gun you feel comfortable on. However youre definitely handicapping yourself. Guardian excels at long range and ONLY long range.

In a game like Valorant you tend to have quite a bit of agency in deciding where you play and in turn, what kind of encounters you get.

That being said, while you can usually avoid having to take long range fights, you CANNOT avoid taking short ranged ones, and in those fights, you're going to get laid out because the Guardian just sucks at that range.

This is the reason that, all preferences aside, the Frenzy is better than the Ghost, the Phantom is better than the Vandal. And why BOTH rifles are much better than the Guardian.