EVE functions on the principle of accumulating 5% - 20% performance bonuses from as many sources as possible, until your ship’s overall performance is 2x, 3x better than when you started. Train skills, fit appropriate modules, fly properly (correct range, etc.), these are only the beginning options for bonuses. Rigs, overheating, fleet bonuses, implants, drugs (boosters) provide significant bonuses that can’t be ignored in PVP, and certain PVE scenarios (incursions, burner missions, etc.).
It’s like playing other MMO’s with no potions, no equipment enchants, no group buffs, and no poisons on the weapons.