That’s up to them to get the propper tools for DPS.
Never saw HoX surpassing Sin but maybe their Parsing was wrong or they weren’t that good or well Equipped. Interesting.
The problem is that exist players who want to specialize on something. This is more of an issue with Conqueror (Carnage vs Brute) because it interfers with Playstyle and Combo/ Ability Keybinds and muscle memory including the need to hoard a ton of Gear. (Not an issue with DT or Guard)
That’s why many who play Brute don’t have a Carnage spec because the setup is entirely
And clearly Funcom designed Carnage as an option for Conqs to specialize with including T3.5 and T4 options to either go for Brute or Carnage with Barb Arsenal. The Milites Templi Set does have a all in one Physical Tanking/ Carnage purpose and the Tanking Weapons were designed according to T3 meant to be combined with T3 Protection accesories.
But you cant specialize on Both and Master them especially if you PvP with it as well. So you find more Brute Mains or Carnage Mains and the latter is being disregarded alot. It can certainly stay propperly in Frenzy with the right equipment and top the parse in dps if managed well.
But i think that’s also the problem. Most people hate DT too only because of DPS parsers even if he can Tank and Survive just fine. But to be fair DT doesn’t share Aggro so it’s a completely different story which is not the case with Carnage who avoids aggro in the first place but can still off-tank when necessary.