When to use Cure 3 or not

[Spoekes]

That is great advice... for players who do not seek to learn and improve.

I think it was worded badly and you forgot to quote the second sentence, it belongs to the first.

As long as you keep the group alive, do what you think is best, let it be damage, click the switch mechanics or whatever.
I would interpret it as: Do you Job, improve on the rest at your pace that is fun for you.

No one will dispute that doing a little damage instead of being idle is better, but you do not need to do that to succeed, especcialy while you are learning basics of your job