To be honest, I hoped microsoft and their windows rt experiment would be the 'alternative' to that so you have three choices for the end-user (get chromeOS, iPadOS or Window RT). To get 'stuff done' a user really has no business having access to the system or circumventing controls.
Currently most desktop management structures try to do it backwards by taking an OS, i.e. macOS or Windows, and then trying to glue restrictions on top of it which always leaves holes or undesired side-effects.
The best 'middle of the road' so far seems to be active monitoring with Apple's or Microsoft's native management tools or with stuff like OSQuery; it also tends to be less intrusive for people that are convinced they are 'better than average' (nobody is) and don't need to have an MDM babysitting them.
But even then, there will always be people thinking their personal preference definitely means the big bad corp did it wrong or their personal need is more important than trying to do something about the constant barrage or crap any machine faces during its lifetime.
What about Windows "S Mode"? That's sort of the latest iteration on the Windows RT experiment, but you can turn it on/off on any Windows PC now.
I know the complaints remain that not enough apps are in the Microsoft Store, especially compared to iPadOS and Chrome OS if you include Android apps, but it is comparable to Chrome OS without Android support and still seems like an "alright, not terrible" third choice.
Currently most desktop management structures try to do it backwards by taking an OS, i.e. macOS or Windows, and then trying to glue restrictions on top of it which always leaves holes or undesired side-effects.
The best 'middle of the road' so far seems to be active monitoring with Apple's or Microsoft's native management tools or with stuff like OSQuery; it also tends to be less intrusive for people that are convinced they are 'better than average' (nobody is) and don't need to have an MDM babysitting them.
But even then, there will always be people thinking their personal preference definitely means the big bad corp did it wrong or their personal need is more important than trying to do something about the constant barrage or crap any machine faces during its lifetime.
For the home user, all bets are off.