For me, altcoin has many advantages, one advantage is it gives to the individual money to sustain the basic needs, It also reduce the increasing number of unemployed in some countries, The people who work in bitcoin develops the ability to reason out, enhanced the English proficiency, that's the some advantage of altcoin
The advantages of altcoins is, they have something that bitcoin doesn't have.
For example, in ETH there are smart contract, a features that can automate the token transferring to speed up the transactions process.
If you look at the other coins, they have unique trait that we can use to simplify the usage of cryptocurrency.