Support gem middle ground. Let people have dublicate support gems, but at a cost.

While the support gem limit of 1 could be irritating, it did make the gem system more interesting. Being able to use the same gems for every skill in 0.3 is going to make variety stale again.

I recommend an in between system where players can have duplicates of the same support gem, but the attribute requirement ramps up for every duplicate copy equipped. Such as 5+10+15=30 attributes for 3 copies as an example. This way, just like skill slots and unset rings, all classes have a way to build around the gem limitations. This would also make having excess attributes feel more relevant.