Skill level necessary to clear HW MSQ content

[ItMe]

But saying that you have to to the extra-hard content first so you'll recognise what to do when you see the same mechanic in a normal-difficulty fight later is putting things back-to-front.

As far as I can tell no one is suggesting that.
OP has repeatedly expressed interest in doing the harder trials first and I, for one, am just saying "you really don't need to, but you're right that they would help you grow."

[Iscah]

As far as I can tell no one is suggesting that.

You were the one suggesting that (or at least appearing to suggest it), though. Thus my comment was directed at you.

Hasrat said there was no need to do hard content just to learn specific telegraphs. You responded that there's value in learning the "early fights" before moving onto later ones - which in the context of OP's intent means you're saying there's specific value in learning those "earlier" EX fights so you'll recognise the mechanics before moving onto "later" Heavensward. Which isn't any more logical than learning them at whatever future point you first encounter them because it isn't any easier to learn then in one place or another.