What's the lock key? That seems like something you need to either explicitly turn on or press.
it is part of the OS, not a third party app. So I think that complaining that it is badly designed is fair.
I can complain about the default configuration too if you want. It takes away the function keys I actually need and replaces them with a screen. The lack of tactile feedback is really annoying. Even after configuring the touchbar to display the function keys by default in my IDE, it still bugs me and make me 'mistype' more than ever on this strip.
I used to have very hacky scripts in order to enable this feature, and this awful touchbar button is even worse.
Good that it is finally implemented ! Weird that it took so long but it is finally here.
Thanks for the tip !