Why isn't an "easy lock switch" something that is standard for floating bridges?

It seems like such an obvious feature of a Floyd Rose or an Edge or any floating bridge, that you should just be able to flick a switch on your guitar, or even just turn a knob, and lock the bridge in place when you don't want any slack.

I shouldn't have to unscrew the back and put a block in place.

I see that some third party manufacturers make things but they are not popular or well known.

Is there some technical problem that's prevented "easy lock" from being standard across all floating bridge guitars?