Im not sure if pushing past 10 makes a difference but player leveling does seem to change the scale of the summons though I am not sure that lone wolf has any impact on summons. That said, just 10 summoning kept the incarnate relevant all game long on the highest difficulty for me. Actually, the incarnate is best skill in the game and extremely useful in hard battles. The reason is the are like having another character on the field which means more actions, more hps, more targets, and more damage.
Honestly, even if they did half their current damage, they would still be worth the 1st round casting. The reason is that this game revolved around control of the battlefield. As long as you can control your enemies, you will win but if you lose the control, you will have a hard time. Summons block paths making them very useful. The fact that they can cast spells and do damage is a bonus. Even the debuffed skele-spider is still useful for blocking enemies and delaying them for cooldowns and for wasting their attacks. They also make for great lures in large battlefields and some of their immunities are very useful in certain battles. They never got old in my playthrough and frankly, having 4 characters with level 10 incarnates is practically broken. 8 units that can all move is very strong.
