good points brought up. my thoughts for you to also think about would be if you may go further in diving. master scuba diver requires proof of 50 dives and dive master proof of 60 dives.divemaster also requires documenting proof of night diving and underwater navigation. while night diving may work by checking the time of dive, it would be impossible to verify a nav dive. if instructor may be in you future your log book would be need with proof of 100 dives and im sure your computer would not work.so as a rec and tech diver it should not be needed, you never know what the future will bring and you may wish you had logged them later.