Damage and killing will always be the number 1 priority since you need to kill things in this game to progress and who wouldn't want to progress through the game faster by killing faster? I guess its only natural.
The only way you can fix sadia is either Buff dolls to the point where they can do sizable amounts of dmg. Or Buff dolls to the point where their healing and support is powerful enough to justify their presence on the field.
I`m sorry, but in my opinion, your statement is false. Games that only focus on damage, with no interesting mechanics to help support that damage, will fail against other games in the market. Wakfu has the advantage of being really unique, though.
Not only was my Sadida increasing how fast we could kill, allowing us to progress faster, but the party could do it in a safe and easy way. Yes, its a different play style. Instead of having a difficult time `trying to deal with all of these random mechanics, I was able to let the party have an easy time killing these monsters at the same or quicker rate.
You are also incorrect about how to buff Sadida. There are many, many alternatives that would allow Sadidas to be buffed. Your thinking seems to be very narrow, though, so I am not surprised by this statement.