Which Groupset?

I've not heard a single 11sp Shimano/Sram owner mention issues with getting or keeping the bike in gear. Have you got stretching cables, sand in your vagina shifter or something?

As far as other features in the 105 line, there are minute differences but not something I would consider upgrading over unless you're already deciding on a new bike. There are minute differences in shifter ergonimcs. The crank uses a revolutionary 4 arm configuration rather then conventional.

The braking and front shifting feels better to me than the 700 series.

I'm not sure the new cranks are exactly "revolutionary...rather than conventional". If it's on 105 it is the new conventional. It does mean all rings are available to everyone (going forward) which is nice.