What even is the purpose of all those non melee/blm jobs?

[Azuri]

I said, explicitly, the game is broader than EW content. Jobs are balanced with all content in consideration. Many of the battles, Ex and otherwise, within XIV, that stuff matters.

Stares at the state of lvl 70 ults

Yeah, that ain't it, chief.

[Beddict]

I said, explicitly, the game is broader than EW content. Jobs are balanced with all content in consideration. Many of the battles, Ex and otherwise, within XIV, that stuff matters.

Stares at the state of lvl 70 ults

Yeah, that ain't it, chief.

Yeah, Azuri is right, SE doesn't bother balancing Jobs for content outside the previous expac. The FFXIV subreddit mods and MrHappy had a group interview with Yoshi-P during the Endwalker Media Tour and he was asked about the balance of old Ultimates. You can find the full interview here, and here is a transcript for the question:

/r/ffxiv: With the change or renewal of jobs, especially Summoner, what are your plans for balancing old Ultimates? Could you tell us about your plans for future Ultimate content as well?

Yoshida: For previous Ultimate content we actually did not make any sort of adjustments specifically. Since their implementation, people’s item level has only gone up so people have better gear to challenge these Ultimate fights so it might actually be… I don’t want to say easier but it’s not as strenuous so to speak.

And we just recently saw Rich Campbell play one of the Ultimate fights, MrHappy was there to help him out, but all of the community was so excited for it so I was really happy to see that.

As for future Ultimate content our next one is Dragonsong, again apologies that this has been delayed, and we are on target to release it at 6.1. We have our staff members that have completed their work on Endwalker content already working on this next Ultimate. I am hopeful that we will make it in time.

Beyond that we are already thinking about the next Ultimate, we’re hoping we can do at least one more in the 6.x series. I hope we can do more but for now we are thinking about the next one after the Dragonsong War Ultimate. We are starting to put together our image and putting together some artwork so we are hopeful we can deliver content to you.

He straight up said they didn't bother balancing old Ultimates going into Endwalker. They just dropped shit like EW SMN into UCoB where it is the highest damage Job in level 70 content. For comparison, BLM is the lowest damage Job in level 70 content. The devs can't be bothered to balance Jobs for old Ultimate raids and you think they give a shit about stuff like old EX Trials or whatever? Not in the slightest. If it isn't MSQ or current expac, the content may as well be considered dead to them.