Daeriion tackled some of this nonsense already. So I needn't repeat what they said. Instead, I'll address the rest.
I never said this. You even quoted my exact response, which was, "They used a UI plugin which put abilities timers on the party list, something Yoshida has even said they're considering doing themselves."
Note the word "considering" and how it isn't an affirmation. What I said was precisely that, the dev team considering overhauling the UI based on the third party tools people have been using. I don't really think that needs further elaboration.
I do, however, want to touch on this because I also know several entire raid groups who used this specific plugin. In fact, you mention Xeno several times now yet if you happened to do even the slightest research, you'd know his discord is where a lot of people found out about it. And where clips of what happened with Bagel and Hiiro were posted along with reddit. Just because your friend used them that didn't work doesn't mean SE targeted any of these plugins.
Tell me you haven't raided in Stormblood without telling me you haven't raided in Stormblood.
Jokes aside, I'm going to assume this was a hilarious typo on your part considering Dragoon was one of the most overpowered jobs of that era. Not only does it still have Battle Litany and Dragon Sight, ya know, two raid buffs. Stormblood was when it gave the Piercing debuff, which was a permanent 5% damage buff to both Bard and Machinist. Dragoon's presence was more a lock than any other job in the entire game and was considered "The Big Three" alongside Ninja and Bard as the three most insanely overpowered comp you could have. So much so, Dragoon's UcoB clears were more double Monk, Samurai and Black Mage combined.
With that said, you're still missing my point. The issue wasn't simply how powerful the comp was but that selfish jobs actively hurt your parse ranking due to them not contributing any buffs and FFlogs using personal damage instead of raid damage. If that system remained going into Shadowbringers, Samurai, White Mage and every other selfish job would have remained dead on arrival for the precise same reason. The creator of FFlogs even admitted the introduction of rDPS was entirely due to the sheer abundance of Dancer padded logs essentially ruining the ranking system. Likewise, the current tier of Savage does not, in any way, necessitate two healers. It would be far more efficient to bring five DPS. So why have none of the speed kill or parse groups done it? Because FFlogs requires a standard 2/2/4 split. If that ever changes, you'll instantly see every upper midcore group and higher telling one of their healers to pick a melee they wanna play.
Many who have had enough yet the program which allows all these plugins to function is only a few years old and among the most popular things downloaded in relation to FFXIV. Even Casual players want it for the QoL features. What you're saying just isn't lining up with reality.
You do realize sold copies does not mean active players, yes? Unless, of course, you genuinely believe the advertising nonsense that "over 24 million players are playing." If so, then why are people saying WoW is failing when they have 60+ million according to their advertisements?
In reality, the number is significantly lower. Our best estimation is based on the Lucky Bancho unofficial census, putting the active playerbase at 1.33 million. 300k of that is roughly just above 1/4th. Wanna tell us all again how third party tools and mods aren't exceedingly popular?