[rootusrootus]

Every time someone says the word Android in this discussion, the next reply is that Android allows any <insert software here> you want, therefore it's up to that software to implement such a lockdown feature. Ergo, "lockdown mode" isn't able to be a thing on Android. And following from that, if iOS is forced to have all the same openings, then Lockdown Mode will be just as meaningless.

[modeless]

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.