Comment by sheepscreek

I don’t think the congress intends on prescribing the particular technology in use to accomplish this. That, would be a bad idea. They should set the goals (what constraints are acceptable in the name of making this technology affordable).

If it is being left up to the manufacturer, then half the arguments being mentioned here are moot. Other manufacturers are free to get creative about it. I can think of a few different ways myself - even something like assisted manoeuvring of the wood piece without direct contact of the hand, a retractable shield, etc.