You're not making any sense. Google could easily implement a lockdown mode on Android in exactly the same way. Sure, you could choose to use a browser that does

You're not making any sense. Google could easily implement a lockdown mode on Android in exactly the same way. Sure, you could choose to use a browser that doesn't have a lockdown mode. You could also choose to turn off lockdown mode! It's pretty much the same choice. Having that choice to disable lockdown doesn't make lockdown meaningless. Lockdown is voluntary.