Things would like to not see again, Forced Job, COPY / PASTE and Chaos

[Atoli]

It does not follow along with typical FFs and a franchise that's lasted for >20 years should not change so drastically from what has worked.
If a pt's going to do something and they need a tank they aren't likely to take you along in the 8/8 spot if your not a tank.

Welcome to a world in which you are NOT the only player
It's an MMORPG, other people may take whatever class they want to take, and if they want a tank they have every right to only take tanks.
You are not forced to join their party.
Heck, if you want to play only BLM, fine! Build your own party and YOU will be the one to decide what you need. And when you filled your party with 7/8 DDs and healers, I bet you'll only take a PLD or warrior for the last spot, too.

Also..you can't compare an MMORPG with offline FF titles.
The mechanics are completely different since offline titles only have to cater to solo players while the world of an MMO is always populated by dozens of players which will meet, interact, and so on.
But even if we ignore that and only look at "what worked in the previous offline FF titles": In many your characters had a certain job or class which could not be switched to something else, and even if you had the chance to change it you probably were still forced to have different kinds of fighters in your party because 4 whitemages made you wipe during every bossfight.
So you were also forced to have a melee DD and whatever in those older games, even if you only enjoyed healing and buffing.

Taking a little time, being able to do things differently, really getting into what your doing, these are the things that make games fun.

These are the things I do in FFXIV everyday.
All 3 things you mentioned are stuff the player does, they are not provided by a game. You can do stuff differently in FFXIV, you may take all the time in the world and totally immerse yourself in what you are doing, it's perfectly possible by the game mechanics.
If you decide to do it or not is a decision only you can make.
To me, you sound like someone too lazy and too afraid to play in your own way, and you blame the game for it.
You join other parties instead of building your own, then compain about them wanting you to play another class than what you want to play and them fighting differently than you want to do it.

I play with friends all the time, we build our own parties, sometimes invite a few strangers, and WE make the rules.
We decide which classes to bring, which monsters to kill.
I never even once felt FORCED to a certain playstyle in this game.
But that's because I actually DO something instead of whining why things dont turn out the way I want them to when I do nothing to make them the way I like.