New Caster

[MagiusNecros]

Yoshi P already kinda said no to Necromancer because he doesn't want WoLs to do things that are pretty generally accepted as evil. Hence why Green Mage as an enfeebling themed Job might work as a close second to that kind of playstyle for people that want a DoT focused thing.

Whitebrim Massacre goes brr. Also Garleans see you as a monster, and you were a walking death machine in Shadowbringer.

Green Mage in it's entries fits more IMO as a Tank given it's defensives and debuffing abilities which would be interesting although I can see Time Mage making for an amazing Magic Tank.

I feel like if they wanted to remove DoTs why keep them on:
Healers(DoT)
BRD(2 DoTs)
PLD(CoS, Goring)
GNB(Sonic Break, Bow Shock)
DRK(Salted Earth, Living Shadow)
DRG(Disembowel, Chaos Thrust)
SAM(Higanbana)
NIN(Doton)
MCH(Bioblaster, AQ)
BLM(Thunder)
SMN(Slipstream)
BLU(Bad Breath, Aqua Breath, Song of Torment, Aetherial Spark, Mustard Bomb, Nightbloom)

15 out of the 20 existing jobs has them. I have this feeling DoTs from Summoner got ejected because another job is probably gonna have them as a class defining feature. Kinda like how Reaper has "Heavy Thrust" as one of it's "gimmicks".

Oh man could you imagine if a new class gets Kaiten but named different as it's class gimmick? Oh the salt...

[Renathras]

Whitebrim Massacre goes brr. Also Garleans see you as a monster, and you were a walking death machine in Shadowbringer.

Yeah, but defiling the dead is considered a particularly evil act, and I'm not 100% sure, but I feel like in Japan (where Shinto/ancestor worship is a thing and it's a high honor/shame based culture), there would be a REALLY strong aversion to raising and animating people's corpses to fight for you in battle. And if it isn't that (e.g. summoning voidsent - which is close to that but not exactly that), then it wouldn't be Necromancer anyway.

Green Mage in it's entries fits more IMO as a Tank given it's defensives and debuffing abilities which would be interesting although I can see Time Mage making for an amazing Magic Tank.

Maybe, but both are far more likely to be introduced as casters than tanks, I'd wager.

I feel like if they wanted to remove DoTs why keep them on:

Right, but do the math on this per raid team:

Healers: 2
Tanks: 2, with at least 1 being short duration (Circle of Scorn, Bow Shock), and WAR doesn't have even one.
Melee: 2 if you have a SAM and NIN who is inexplicably using his AOE rotation - Doton isn't a single target ability. Or DRG and MNK (you forgot Monk's, I think...Demolish?)
Ranged: MCH is the only one with one, and it's a short duration with a CD only used in AOE.
Casters: BLM and SMN each have 1, RDM has none.

BLU, as we all know, isn't allowed in general content.

And several of those aren't DoTs (debuff on the boss); Living Shadow and Automaton Queen are not, so they don't count towards the DoT stack/debuff limit.

So in practice, in a raid fight/8 man boss, you have 4-6 with +2 during Tank burst phases if you don't have a WAR Tank. And of all of those, only ONE is really central to the class in terms of something other than "don't let it fall off", which is BLM making use of Thundercloud procs. The rest are either a strict part of the rotation (e.g. PLD, SMN, etc) or are something used to refersh the DoT when it's about to expire (all healers)

If you have a DoT heavy roster, something like PLD/GNB/Healer1/Healer2/DRG/SAM/BRD/BLM, then you end up with 8 DoTs kept up all the time with +3 (I think it is) situational/short duration DoTs that come up here and then fall off. So the most DoT heavy standard party is 8 DoTs with short spikes up to 11.

And yeah, I have no idea why the Dev team makes things like Sonic Break while also saying they want to reduce DoTs. It makes zero sense to me other than flavor/aesthetic of wanting buttons that are "more interesting" than just "does direct damage" or something.

EDIT:

I highly doubt you are going to reach 48 debuffs on a single enemy outside of at best an Alliance raid.

Not that the game is balanced around them (but you're bringing up BLU and the game isn't balanced around it, either), but hop on a Hunt Train and you see this on every single boss.

A DoT-centric spellcaster would be expected to have AT LEAST 3 DoTs, and probably more like 5-6 if the entire theme and function of the Job is based around DoTs; 3 to maintain all the time and 2-4 short duration ones attached to CDs that line up during burst phases. Meaning during Burst, the boss might come pretty close to that cap, especially in 24 mans, and if you have more than one of this Job in the party/raid.

I'm with Saber on this one:

But yeah. Their design space regarding dots is hampered by server tech from the Jurassic period. That's probably why.

As much as they seem to LOVE slapping _A_ DoT on every Job and their grandma, they seem not to want to make Jobs with much more than that. BRD is the only current Job that seeks to maintain full uptime on 2 DoTs, and no other Job has more than 2 that it can apply, and generally with one of those being on a CD so it's not 100% uptime. I can't think of any Job besides BLU that breaks that rule.