This is a REALLY bad idea I'm afraid. It introduces another SKU for developers to work on and immediately kills or greatly limits touchscreen-first games.
It also kills the primary USP of the console - being playable in many life scenarios.
This is a case of a gamer primarily only thinking of their own personal circumstances without considering other factors and also being over obsessed with power and numbers over gameplay.
So your idea is to... Un-Switch the Switch and kill what makes it unique?
I think its not inherently a bad idea. Easier execution would use the same components, just put them - motherboard, dock and psu in a new small box, and keep the performance and all mechanics of a docked switch, so there is no need to change the games or system. It would be a permanently docked switch for cheaper. I dont see why not, pro-controller already exists, it would definitely find buyers if the price is right...
Btw "Opinion by ..." is this how we call now when AI rewrites articles from Digital Foundry? 🧐