In general I agree, but:

"Players will farm more useless cards. Will you play a 6 mana cost summoner with no abilities? (soulbound so it cannot be traded or sold)"

Here you oversee somthing - this summoner have abilities besider conscript as they have +1 speed, -1 speed, +1 life, -1 life , +1 armor, -2 armoer also, but you are right that this isn't worth 6 Mana, I consider them as a 3-Mana-Summoner without conscript so you "pay" the double price 6 instead of 3 Mana - I have already pointed it out but without any answer from the post creator.

I have also addressed this before in the discord, so again the DAO just burn 100k DEC for nothing.