We used to use PC tools to do things like place orders, deal with customer service, do banking, budgets, and more. All are phone tasks now for billions. AND more volume and new things.
Many things ran on mainframes for years after PCs took over.
Many things ran on DOS for years after Windows “won”.
Many things ran as Win32/OSX apps even though phones dominate computing.
In each case, the new way opened up a scenario to an order of magnitude more people.
Really interesting thread from a guy who knows a lot about this stuff.