Without naming designers, one shared with me he decided to use either 6DJ8 / 12Axx instead on his next version preamplifier because he felt the availability of good 6SN7 supply was dried up or hoarded away. That was 4 years ago.
Today we see more new production and updated 6SN7 / CV181 tubes showing back up from across the pond, more people testing them out, all hoping they last longer than a year or longer than any of their NOS stored away. I'm on that list myself. Not sure how this may or may not influence component designers moving forward.