What? Planning a first aid kit shouldn't be that subjective.
Being educated is very important, but bring some tools with you so you can do the job. Its a lot easier to stabilize a broken femur if you have a roll of tape and perhaps a telescoping hiking / ski pole, for example; or to splint a broken arm or hurt shoulder if you have a SAM splint and some triangular bandages.
Sure, there's a fairly infinite amount of ways someone can be in need of medical attention in the backcountry, but minor trauma is going to be the most common, so plan for that. Abrasions, puncture's, avulsions, possibly simple fractures.
For major trauma, you should be able to make an attempt to stop bleeding, and perhaps stabilize a major / complex fracture or head wound. But really, for a major medical event or serious trauma you're pretty much fucked anyway.