I have played the OG SMN and outside of dungeon content. SMN was pretty "rough" to play. It had a fun playstyle, but it required waaaayyyy to much nuance to play. I just remember to having to delay a lot of my summons as I knew the boss was going to jump, or become un-targetable, or a phase transmission, or a raid wide stun, etc, etc. The point that I'm poorly trying to make is that SMN had an incredibly strict rotation. You fall out of that for like 5 seconds....NOTHING LINED UP. You had to play perfectly...every....single....pull...
The job was tuned for high level playstyle at level 50 onwards...at 80 you were being punished as if you screwed up your opener in faceroll content. Was it fun when it all clicked...sure I'll give you that. But when the poop hit the fan and you fell out of sync...it was like literally 3-4 min before you could sync it all back up again.
If I look at this objectively. This is still an iteration of the SMN we had at 80, but they literally doubled down on the Egi-Assaults and gave us an actual summoning each version while telling the summons what to do. Should they have removed the DOT's? I'm on the fence about this one. While I did like the DOT gameplay of tri-disaster and Bane, but I felt it ONLY provided greater benefits in an AOE setting.
That is what I liked about the DOT's, when you spread them out to a large pack of mobs. Then you go into EX or Savage....you hardly ever use Bane...if at all. You had to hard cast your Bio and Miasma after Bahamut phase to have it carry you to the next Firebird Trance, so the DOT's I felt were mis-used in the ShB version of SMN. Hell BRD get's Iron Jaws and can cast that literally ANY TIME, AND gave you the chance of a refulgent. If Tri-Disaster would have done that then people would complain SMN was to much like BRD... I digress.
This current version of SMN reminds me SOOOO much of FFXI version of SMN. Actually summoning your large size primals, they actually attack, they have crazy damage. The only difference is that in FFXI your summon stayed out for as long as your MP held out as your summons slowly drained your MP, and actions required MP to use.
I was not an expert by any means at 5.0 SMN, but I could play it well. I just didn't get stuck in the finite math needed to play it at GOD tier.