After the Shadowbringers Update, the Summoner and it’s base class Arcanist has some problems related to Solo Leveling.
Pet Attacks are now AOE Attacks
First, at lower levels, the Emerald Carbuncle [blue caster pet] now appears to shoot an AOE which covers quite a large range, and may bring unwanted foes [mobs] to bear on the player. In previous releases, the Carby did a single target attack which did not aggro other mobs. Here is an example of the size of the AOE that the Carby does now.
Apparently, anything hit by the big green area, which is the auto-attack cast by the Carby, is aggro’d on the player. As you can see, two king wespe mobs are now attacking the player. Mobs do not attack the Carby, but only the player. This problem was so severe that I had to dismiss the Carby when doing a Fate at my level to avoid being overwhelmed by aggro’d mobs.
Secondly, the Topaz Carbuncle and the later upgrade to the Titan Egi, were Tank pets, which took aggro from the player. This effect has been removed. The rumor is that the pets are all the same, doing the same attacks with same potency, except for animations. In other words, the differences in pets are now just Eye Candy. I have yet to study this in detail. But it is clear from my testing that the Titan Egi no longer takes aggro. So this is a significant loss for the Solo viability of the Summoner.
But there’s another problem with the Self Heal for Summoner as well.
Windy Weather 