I love that Bionicle was rebooted, but I wish it was handled slightly better. These are some areas I believe could be improved upon where the physical sets are concerned.
Number of Sets
Though both the Winter 2015 and Winter 2016 waves were a decent size, I think the Summer 2015 wave was heavily lacking. There were only five sets. Granted, there may be a reason there aren't as many sets, such as the line not being as popular.
Hold on, let me preface this by saying I in no way dislike CCBS as a building system. It has many upsides and uses. One issue I have is that the some CCBS pieces have too long of a lifespan. This may be cheaper for Lego, but the main limbs, torsos, and clip on armor have been in circulation too long in my opinion. The way Lego uses CCBS makes the system out to be too simplistic. It has so much potential, but Lego is playing safe. CCBS should be combined with Technic the way old Bionicle was. As Eljay explained in his video comparing G1 Bionicle to CCBS, the older parts were weak and broke quite often whereas CCBS parts are sturdy. I wish the old limbs with the three pin holes down the center could be brought back, but this time made the way the CCBS joints are so that they would not break. As good as CCBS is, I think old Bionicle was better where complexity is concerned, and that is in large part to the Technic nature of many of the pieces.
I want to see more "Witch Doctor" and "General Grievous" like sets that combine CCBS with Technic. We have arguably not received any titan sets in G2 Bionicle, and I think that is a shame. The most expensive sets ("Mask Maker vs. Skull Grinder" and "Kopaka and Melum Unity") are just compilations of characters that could have been released individually. I like the existence of more expensive sets for hardcore collectors like myself. I'm not saying we need a $90 Scopio, but I think some $40-$50 sets would be really interesting.
This is the area that only slightly bothers me, and doesn't really change my views on G2 Bionicle that much. I wish with the Summer 2015 Skull Villains, we could have gotten six elementally themed villains and then a titan Skull Grinder to top it off.
We still have at least one and a half years (I'm hoping for more) of unreleased sets to go in the reboot. That means that some of the areas I have mentioned here could very well end up being implemented. I guess we will have to wait and see. For now, let's enjoy the sets we have been presented with.
I am interested to get a community opinion, so post your ideas.