About merge operations: The majority of solo artists and designers don't work in many branches. Most projects just go forward and branches are only useful if a rollback is needed. That being said, Snowtrack does offer a simplified "cherry-pick". But merge operations as you might know them from Git/Perforce are not implemented yet as it takes time to see how users adapt the software.
Keep in mind, most artists and designers are new to VCS or have never heard of it before and therefore it is crucial to find the right balance between too little and too many features. Any second that keeps the artist away from creating their artwork is wasted and therefore and the goal is to not interfere with their workflow or to add additional "management tasks"