Please implement something to teach players how to play

[Shurrikhan]

If this was like mythic plus in wow. Where you lose something for having a bad group.

Only 1 in 5 people in M+ can lose anything. The loot reduction for a failed run has been long since removed. The only "loss" unique to M+ now is for the keyholder to not increase the level of their key. You still get the Valor. You still get the loot. You still get the rating, as long as you did even a fraction better than your last run (as rating is literally just a quantitative summary of your personal bests).

The largest actual loss is just as present in XIV as in M+: time. You will have wasted time.

We don't need reinforce learning, and we don't need a well crafted difficulty curve.

We don't "need" a good game, either. But alas, they're generally far more fun to play.