The original reason they came out was to buff exotics as destiny2 in year 1 everything sucked. I’m hit and miss with this. Yeah it would be good to have more content but the balancing issues with the guns would be worse. Some sucky exotics got a lot better with a catalyst (like the huckleberry). Now if every exotic had a catalyst the ones that stood out because they had one would suck again. May also be harder coming up with catalyst ideas for the exotics. One maybe a massive change, another may enhance the exotic perk and another may just add 2 stability. Last point is the RNG on getting the catalyst in the first place is probably the hardest in the game. Say if so happen one of the exotic catalyst become OP or the meta. People will have little to zero chances of getting it themselves.