Inertia, too. Like, there's almost no reason to still use SMS style messaging. In fact Apple's decision to make their messaging largely incompatible with texting outside their ecosystem is a huge reason for everyone to just move onto a platform like Whats App (yes, I know who owns it) or even something like Slack or Discord.

But here we are. I mean hell, the phone companies were charging for texts not so long ago and we still stuck with it.