I detect some connection to the discussion.
Germany has regulations and specs on bike lighting, including specs on cutoff.
The vendors can meet these specs and therefore sell to the market.
But, it all breaks down if the user aims it incorrectly or ignores others.
If the person does not care about others, there is probably little to be done, other than giving them some feedback.

Another point is that if there were lights available that were both bright, and had a good cutoff, some of us would buy them and aim them correctly.
I made my own collumator from a plastic lid, to help reduce light intensity where it's not needed, but it's not ideal.

For those riders with very bright lights coming towards me in pitch darkness, I have my visor, ....