I agree with you except for one point:

> Even replacing laptops probably won't catch on, simply because companies can easily provide a good laptop for half the price of a flagship phone

You’re comparing top of the range phones to low end laptops. A low to mid range phone can be bought from a reputable manufacturer (Samsung) for about £200 and it has plenty of processing to do email, video calls, PowerPoint, and basic spreadsheets. My wife works for the government and I’m pretty sure one of those phones would be about as responsive as the hunk of junk they provide her with, and for half the price.