I'm not sure if 50 is too much... Twitter crypto folks seems to invest between 2% and 3% of their portfolio in any one given coin.... so I guess... between they have between 50 and 33 coins at any given time.
50 coins would be a lot of trouble to rebalance, manage etc imo. 33 coins doesn't seem to crazy to me...
But why choose 50 coins, what I mean if you really take the time to research your coins then you do not need to make such small investments in so many coins, you can invest a lot more in a coin if the overall number of coins goes down, after all why would you want to hold a few good coins and many mediocre coins when you can hold good coins exclusively.