Apparently, you’ve never seen the X-1 through X-5.
Where they ever scaled up to "production useful" sizes? Experimentation is one thing, practical application is another. We're talking about two different things.
Regarding the X-59, do you think the sonic boom profile of the X-59 will be the same as the scaled up "production useful" aircraft size?
Again, we're talking about two different things. The experimental researchers can go play all they want, but what they play with won't apply well to full scaled production useful sized aircraft.