well,you could get CON, but the problem of getting CON on your support build is that your skills mostly scale with SPR.
If you get a lot of SPR to be useful [~200 base + 100-200 bonus from equip], you won’t have that many points left for getting CON and/or DEX.
Now if we look at what Chaplain is good at, we will immediately understand that he benefits most from DEX, as it provides ASPD,Evasion and Block Penetration.
Also, we must not forget that you can get 10-15% of your SPR converted into CON with Enchanters armor enchants, and by wearing e.g. Plate or Cloth armor, you can get some more bonus CON and Block rate.
Accessories can also help you to get some CON, depending on what you have equipped you can get up to 60+ CON with semi-decent gear and over 100+ CON with decent-good gear.
The main reason why CON isn’t that important anymore is because the max HP will now be affected more by baselevel than by CON;
CON HP gain was nerfed considerably, making CON rather undesirable unless you can amplify the HP gain, e.g. on Kabbalist to up to 4 times the base value.
Another thing to consider is the Healing value; while CON helps regenerating more HP with base% healings [e.g. Heal and Mass Heal], those healing skills also have a variable healing amount that is based on your SPR and INT. If you have less CON and more SPR/INT, your healing gain from these factors is larger than when having more CON[because of the healing amount/max HP-ratio].
Otherwise it’s rather unimportant to spend points into it, as Block got nerfed and the HP regeneration bonus is rather unimportant unless you’re also a Krivis C3 with Aukuras 15 or have money to waste on lvl 10+ Aukuras Scrolls…
Anyway, just something to think about/consider.
Best would be to make use of the resetting event early summer and check for yourselves if you’d rather have Inquisitor or Chaplain or whatever, as you can reset once a day for 1-2 weeks [ no idea how long exactly, we’ll have to see what they plan for iTOS].