Re: A Pebble is Not a Raindrop
This is where I think it is good to make a distinction between a computer system and an application. By computer system, I mean not only the hardware, but the kernel, the UI(s), the tools available for developers, and all the things that, as a non-developer, you don't want to have to deal with. Computers should not be designed for a single purpose, because for everyone who has slightly different priorities to you, it won't be worthwhile. So they won't buy it. So the company making it will have to increase the price so that only those with your priorities can support their development efforts. So you won't buy another one and people like you won't either. So your version won't get updates or support. So the entire thing will be seen as a failure and dumped into the dustbin of computing history.
The computer system should be designed in such a way that as many applications are possible, and then the applications can be written to fit your requirements. What you appear to want is a really full-featured word processor. If you had that, you could stay in it for almost all your time. The problem with making something only that word processor is that there might come a time when you need to do something that it can't, and then you'll want some other application and you probably don't want to buy new hardware to get it.
That's why you need general purpose tools like a mouse. You may not need it very often in your word processor, but other applications will, and the computer will only be useful to anyone, including you, if those other use cases are possible with someone else's applications. If you don't want to use the mouse, you can always unplug it. Removing those things won't help you even if you don't use them.
That's also why ditching the filesystem doesn't work, because in order to move data around in an organized way, you have to be able to find the specific chunk of data you're looking for. The highest-profile attempt to hide that recently was Apple's IOS, and it kind of worked for a while because you can't create that many things on an iPhone and, in the early days, Dropbox was a de facto filesystem for a lot of IOS apps. Of course, it didn't work forever and there's now a partially available file system and a client on every IOS device.