FF14 is not made for hardcore players.

[Granyala]

In some of my recent threads expressing my worry that the loud minority of hardcore players may be signaling a skewed representation of the player base and cause biased expectations among the dev team, I received many thoughtful comments, but also many toxic and mean-spirited comments.

Do not worry, my dear. The DEVs know full well which segment of the playerbase brings in their daily bread.
I'd say 95% of the content is targeted at casual players. You really only get 4 savage bosses and maybe an ultimate every 6 months.
The rest is fairly inclusive.
Yes, even extreme trials are not what I'd call "hardcore content". They require some resemblance of skill and awareness but aren't nearly as punishing as savage raids (esp. with weaker equipment).

Most of FF-XIVs content seems to follow the mantra of "easy stuff with a lot of timesink" so almost everyone can do it.

Do you realize that tanxiety is a thing?

It is not exclusive to tanks though. Healers feel it as well. If either screws up, everyone can see the mistake and we usually get some flak for it.
Hell even DPS would feel it if their performance wasn't hidden by default in order to coddle special snowflakes.

Personally, whenever I perform badly, be it tank, healer or DPS I feel uneasy. As I should, after all, I am wasting other people's time.

You do not need uber skills in order to perform at an acceptable level.

Additionally, no, not everyone has the privilege of spending time at improving at the game. Many of the comments I've received ask me to spend time improving.

Then it is not the right game for you. MMOs are built on being time eaters, the time it takes to improve enough to down content is part of that equation. Though outside of ultimate/savage/extreme, the bar is set so low, it's difficult to imagine that any person that is seriously trying could not manage it.
I postulate that such cases are exceedingly rare. Hell I have seen people with major disabilities IRL pull of acceptable performances.