>>263052
>this is the same for super break
It's not. Aside from superbreak giving its DPS atk% conversion, they also benefit directly damage-wise from atk% itself (they have high base multipliers for non-break damage), and sometimes even crit (Boothill). EHR conversion only exists for BS (and JQ who needs E2 to be a proper DoT unit), and EHR itself provides not only 0 damage but also 0 survivability. Break can run sustainless with or without survivability options (like hp% orb over atk%) and perform well. DoT on the other hand tanks its damage by running a non-offensive orb and can't even run sustainless properly since its damage is dependent on enemy turns, meaning if your DoT proc doesn't kill the trash mob then you will eventually lose the HP battle.
>It is not some fundamental problem that is preventing dot from being good
It is, because you are less likely to get a relic that rolls +5 into atk% and nothing else compared to a relic that rolls 5 into any combination of atk/cr/cd. Your maximum potential is both worse and harder to achieve than normal DPS. You also cannot take advantage of crit damage buffs that are plentiful in this game.
>fixed amount
Fixed 100% crit rate but crit damage is based on your own relic stats and possible conversion from EHR. This is better than just pure EHR to atk% conversion since it adds a new multiplier to your damage instead of just saturating atk, and you don't need to introduce new mechanics to the game that in theory only specifically affect DoT but in practice will be abused better than other archetypes. Let's take your examples:
>it being able to reduce toughness
Works for superbreak since the popular fire break archetype has a DoT running on every broken enemy + high innate WBE so enemies will be easier to break again.
>speeding up enemy turns
Benefits counter units (Yunli), HP consumption (Cas, Mydei) and Acheron more.
>Jingliu
Her main problem is her low multipliers. Forced unavoidable downtime with no means of out-of-turn recovery doesn't help either.