I agree so much with this statement.
So often people will ask me which laptop they should buy and my first question is "have you considered a tablet".
When the reply is "i need a laptop" i ask "to do what" and the answer is invariably something like "email, web browsing, banking". Nothing a tablet can't do.
The tablets can also now do things the laptops can't do.
Unless you really need some specific application, or you need the processing power that the 15" machines can provide, the laptop market is IMHO on borrowed time. The current iPads are faster than the 13" notebooks, and approaching the speed of 15" machines at various tasks. Unless you have a specific windows or macOS application requirement (or, admittedly, you are a heavy multi-tasker), you can do most stuff on an ipad today. You may need to change software and maybe adjust the way you work slightly, but it isn't a big shift and often for the better.
For me, the 13" notebook market is totally dead. And the 15" machines aren't powerful enough for the stuff i want to do that the ipad can't do. So 15" laptops are pretty much dead to me as well.