Value resetting can be disabled within CB Conditional > Parameters. Currently this is global and will impact all conditions as it can not be disabled on a per condition usage at this time. Resetting a value is often necessary when chaining multiple conditions. If you aren't chaining multiple conditions then it should be fine to turn it off.
Instead of using conditional function I could take a privacy setting for a group of fields with one click. Is that possible somehow?
No CB Privacy can not replace CB Conditional functionality in this regard.