4.)Summoners feel very weak the further your level up( I don't believe Summoners scale with attributes like intelligence which makes them awful for anything but decoys unless you are using totem bug from high ground.)
A little elaboration on this, as you picked up Incarnates/Totems do not scale off of Int/Str/Finesse.
Summons scale off of character level and points in the Summoner skill only. At 10 points your summons will have double health and damage and receive double the Magic and Physical shields from all buffs.
You also gain access to summon-specific buffs, E.g. Farsight/Power Infusion which each add a 15% stacking damage buff to the Incarnate, a large Magic/Physical armor, and unlock new abilities for it.
Therefore, whether summons fall off mostly comes down to whether you're going full Summoner (with most points in Summoning and using the Infusions) vs 1 point and just the Totem/Incarnate.
A character with just 1 point in Summoning will find the value per AP decreasing in comparison to their other abilities, whereas a full-Summoner will prioritize the use of Summon skills.
