Like it or not, but Whatsapp has become most commonly used messenger and it is pretty much impossible to make people change it to something else like telegram or whatever. Our company has whatsapp groups for every team and pretty much all info is being send through whatsapp.
So whatsapp is one app you pretty much have to use in todays world if you have friends or co-workers
There are also few other apps i need to use at work to make my life easier.
But android is just awful thing to use not to mention ios.
Having android apps on Touch is a good thing. Don't use them if you don't need em.