I've never had more than 3-4 apps installed on my Nano S but I have read stories about people using up to 10 different apps. The Bitcoin and Ethereum apps take a lot of space and like ETFbitcoin mentioned if you install apps that depend on the Bitcoin app it is very likely that you can get close to those numbers. If not you will run out of storage.
 
Honestly, do you really have 50-100 different coins worth keeping on your Ledger? I don't know anyone that does.
It seems like opting to buy a car that goes 260 km/h although you will never need to drive it that fast.