I do like how visually the 6.0 Summoner looks and works. Being able to summon the OG ARR primals and having the ability to augment our attacks is pretty cool and the change with Dreamwyrm trace into the current Firebird trace was kind of inevitable and neat. But i do have a few issues with it:

You have tons of different Instant casts, from Ruin 4, the two traces, the Garuda and Titan phases and Ruin 3 even having a 1.5 second cast time now. But for ogcd skills all we have is Energy drain/siphon, Fester, Painflare, Phoenix's buff, Deathflare, Aetherpact and Enkindle, and a lot of these are mutually exclusive towards each, you can't use Enkindles and Aetherpact in the same phase.
Personally, I think that Energy drain/siphon should go back down to 30 seconds to create a constant source of oGCDs, and the Summons/Trace buttons should be made into ogcds as well. Then you could at least have some kind of opener like the one we have now: Using Egi assault 2 which is used to weave in dreadwyrm trace, then we can use insta casting ruin 3 to weave death flare and Demi-Bahamut. I think something like that would at least make it feel faster.
Speaking of Demi's, they should not have changed how Fountain of fire and Brand of purgatory work, because now it's just: one button for single targets, and one is for Aoe, and honestly just sounds a little too boring and hits the healer problem of here's one button and the two ogcds you'll get during that phase. This also applies to Dreadwyrm trace as well, which has the same problem.

Granted there's still a lot we don't know about the job yet, like any skills that Yoshi-p didn't have on his hotbars, but with what we have right now that's just what I think should be done.