That is basically the problem. Also that fractional scaling on Linhx generally still gives blurry results. Fractional scaling without explicit support from the apps side is very difficult to implement.
And yes, there are a ton of of apps that don't correctly respect OS hints for size. Even more common among apps that aren't Linux first, or are proprietary.
Don't know if it's succesful, but definitely just straight up stupid.
The are many places where it's not even allowed because it does not meet the local safety and protection standards. It's a fundamentally unsafe design, especially for the people outside of it. It should not be allowed on the roads, and the EU agrees with this.
Even if it was allowed within the EU, you would need a special driver's licence for it.