Re WYSIWIG:
Rather than WYSIWIG being bad, I think the introduction of scroll bars destroyed WYSIWIG from the start. It only works on a large monitor where one page can be viewed and worked upon. In the early 1990s it was only at uni or in the workplace that this was possible. Not at home on a 12 inch monitor. It's the same reason that a web page that is larger than the screen is a health nightmare (mentally and for poor mouse wrists).
Re computing using spreadsheets:
This made computing available to people who couldn't program imperatively. It's given more power to the average power user than you can imagine. See Scott Hanselman's interview with Oz du Soleil. https://hanselminutes.com/532/data-literacy-and-the-usefulne...
Re data storage:
Without the ability to program in a declarative way (i.e. SQL) it is going to be difficult to both store and retrieve data in a provably ACID way, yet non-programmers still get it done well enough with files.
Re Smalltalk:
Without OO knowledge, this great tool will not be useful to any desktop computing power user that has not formally learnt programming.
My point is that the tools that have survived and got the job done in the "computerised office" have not required the understanding of a complete pseudo-math model (aka programming paradigm) in order to get useful work done. People did not need to be able to compile a program without errors. They used tools that can be iteratively hacked upon, and allowed non-purist tech people to become power users in the workplace.
TL;DR
Models of software environments that do not have to be programmable have proved themselves and the people who use them capable of getting the job done. That can't be replaced by your suggested model.