The SMPTE Registration Authority lived for many happy years on the Drupal 7 Bartik (!) theme. Aesthetics have never been the focus: rather, this site's sole purpose is to act as a public repository of metadata items used in applications of Key-Length-Value (KLV) coding such as MXF audio-visual files.
With the Drupal 7 EOL on the horizon, we wanted to relocate this site to a platform that could handle its very Drupal-y structures, but were having a hard time justifying the cost and long-term cost implications of a move to Drupal 10.
Backdrop was a fantastic option for this client! The conversion process was a cinch, and we had the new site up and running in about 40 hours (compared to 100+ hours we were anticipating with Drupal 10).