what would you remove pre60 to add the dance partner?

Beside Curing Waltz and Samba, I'm not sure I would like to swap any of the previous skill for the partner buff. It has a very minor impact in prio to ShB content (especially ARR and HW), I rather have all the core tool available rather than a weak buff to a party member.

One great thing about new job is that they're very good at any level whereras some job suffered many expansion being only good at a certain level.
Great example would be MNK and NIN having very lackluster AOE until higher level.

Also, 50 60 70 and 80 are usually reserved for "big cool skill"
So you wouldn't be able to put anything. It has to be a strong and important skill

And tbh, beside... maybe, Shield Samba, nothing seems to make the cut by lv 60

I guess that's mostly why.
They focused on giving you most of your gcd-skill so you could train your rotation properly.

I guess they could have put it at lv 50 instead of En-Avant tho!