in my opinion, 80 is not exactly right at risk. if I want to buy I have more top20 because the trading volume is quite large. nowadays I have more coins that are relatively safe than coins that can generate big profits. because my goal is to invest here for the long term
Yes, the diversification in larger scale will lead to another level of problems. I never look for investing up to 80 different assets.
I do not know what are the plans people are having to manage all the 80 coins effectively. This is our hard earned money and not just simple work to go for something blindly. Moreover by choosing the top 80 coins, there will be no guarantee for the risk is completely eliminated.