When I played SWG live, Pre-CU, I could solo just about all content with a set of decent Doctor/Entertainer Buffs loaded in. This included the Geonosian Dungeon all the way through Aklay, multiple Nightsister Elders at once, etc.

I used a second account to provide buffs, but never needed it to come along with to assist/heal/etc. I suppose I could've added some additional combat prowess by not taking Medic to First Aid IV for the higher Stimpack usage, but really... it would be negligible gains there.

This was even without using my legendary 100% composite chestpiece.

I guess my point is, why jump through the hoops? It really is not necessary, unless you're trying to PvP multi-box.