Some personal comments....
1. If the OP's friend has 70 dives in he is more than likely competent. I wouldn't worry about him and in fact surprised that the OP would/should/could even question that. In other words, the OP should mind his own business. Seems like the OP is just projecting his own insecurity on his buddy or just yakking to hear himself talk...i.e a guy who has 60 dives in and claims to be a beginner. What he's really saying is "look at me, I think I know more than my buddy who's done 70 dives". Yeah okay, whatever.
2. Diving isn't rocket science, it is fairly easy to do. Back in the day people learned to dive without formal instruction. Most survived. Experience is the best teacher. I've forgotten most of what I've learned in books. I learn something new every time I dive.
3. Who checks dive logs? Can you dive without a dive log? Apparently you can because the "dive buddy" has 70+ dives in without one. I've never, ever been asked about a dive log. I'm old school, don't use a dive computer and keep a hand written dive log. I keep it not because it was suggested (or required?) but as notes for myself.
4. Some of us are occasional recreational divers. Yeah, it's not a lifestyle for us. We maybe don't own all of or even any equipment and maybe dive on vacation/cruises once or twice a year in warm water with a group/guide. Apparently that's good enough, and good enough is sometimes good enough. Don't really need dive tables, dive computers, logs or anything else for that mater in those circumstances.