its never useless if rockos is busy with life and reworking the skill tree.Would be useless to try to change thing on your mod for the summon as Rockos ARPG doesn't provide any significant bonus for summon (and trowing) compared to other sources (magic, ranged, melee).
In can do 150k+ dps on melee with not much trouble late game while summon do 100-2000 dps (with the correct stuff , which reduce my melee dps a lot)
You can try to look at it later when Rockos ARPG stats on level up affect trowing and summon damage value. Meanwhile, best is to just let it go. (doing 1 or 100 dmg is useless in both case when you hit hardmode as *most* summon prevent you from hitting a mob)
if people want to play summoner and dont want to be too overpowered (which happened to me like 5 times already, even with my own mod (older version though)) but have trouble due to the scaling, then i simply make changes to my mod (like i did in the current version) and they can actually deal damage again.