So the Eidolon's Proficiencies are listed as:
Proficiencies
Your eidolon’s level is equal to yours. They begin as an expert in Fortitude and Will saves and are trained in Reflex saves. In addition, they’re trained in unarmed attacks and unarmored defense. **They share your skill proficiencies.** Certain class features increase your eidolon’s proficiencies.
I like this class feature. It helps simplify the complexity of managing two statblocks.
I like the flavor of the Class Feat Dual Studies:
You and your eidolon have each practiced some skills on your own, though not all your experiences translate with the shared link. Choose two different skills. Your eidolon becomes trained in one of those skills and you become trained in the other skill. At 7th level, you each become an expert in the chosen skills.
I, however, find it confusing from the way the Eidolon's skill proficiencies were implemented. The flavor of the class feat seems to be that you and your Eidolon uniquely gain skill proficiencies that differ from each other but it seems the way these two mechanics would actually interact would be:
*You become trained in a skill and therefore your Eidolon also becomes trained in that skill. Your eidolon becomes trained the other skill and you do not become trained in that skill.*
Specific overrides General and maybe this Class Feat is meant to override the general Eidolon Skill Proficiences but it isn't clearly worded that they wouldn't gain the proficiency from the skill proficiency the Summoner just gained. I think this class feat's wording should be clarified if it's kept as is in the final version.
