There are workarounds but they're not as painless as simply deciding to 'use an alternative chat alternative'. It's like saying you don't like English? Well try esperanto and good luck functioning in the US. I've given some extremely exaggerated examples, particularly this last one haha, but I've found reliance on Whatsapp to be substantial and on the rise.
I do agree by the way that this isn't that big a deal. I'm completely fine to continue using them, but if I wasn't the proposed 'just stop using them, there's chat alternatives' really doesn't fly. It'd be really shitty.