Hi, all! 
What for full definitions if by default the company ensures all users about no problems with many not listed malware (if smart def. is by factory settings)?
What will be if cause of non-full definition set is to use and somehow to meet the malware not present in that definition set?
What if Heuristic and SONAR engines will can not detect it?
Why not to use full definition set?
Why not to smart definition set?
Al last, why this option is for users, not for competent vendor of AV?
Thanks for attention!