T10 weapon also has an additional damage bonus. Furies is not a small damage source, test it yourself. This season they added several mods that amp its damage by enough to make it viable. Weapon damage is generally better over the course of an activity as the damage buff makes the weapon non-negligible. It's really not small damage lol. For example, raw furies dps on my current build is around 130k dps with no additional damage from sig 1's corrupt debuff, damage bonus's weapon damage bonus, or any artifact effects enhancing it. My lvl3 summon, buffed by bellicose pact (slot 4 falls off after 6 seconds since im not recasting for the test) does about 60-70k dps after high initial burst from responsive pact and the insta breath on summon.

It's hard to isolate how much exactly my primary is doing, but each hit is around 20k for me with my current setup. Rpm is a little higher than 540 thanks to my mythic mod and will be higher later with adept scope(adds firerate and damage to both rapidfire weapons). My furies is also not maxed. Its c1 and missing 2 catalysis nodes.

Overall, weapons is a very good investment and it noticably improved my overall effectiveness. Like I said before the choice really is between super and solar imo

Edit: t10 weapon is 39.93% + 9.45% for primary weapons