What are they going to be replaced with now? You still can't do anything actually useful on a mobile device. You need an actual computer to get anything done besides dicking around playing games or scrolling through apps.
8 years ago, we looked for our house, managed the loan process and all of the documents, signed all of the non in person paperwork, reviewed the options when he had our house built from our phones.
We did the same when we managed the selling process in 2024 and when we bought our current home in 2022.
We arranged a year long “digital nomad” series of trips where we flew to over a dozen cities including flights and hotels on our phones starting in 2022.
People do “useful” things with mobile devices all of the time with only their phones. Most people don’t define “useful” as running VIM in a terminal and running Docker.