No idea. It is old as shit and equally annoying. There are many reasons why we (architects) minimize L2 domains - namely because we can achieve re-route / convergence quicker with other protocols, with STP being the long pole. Hell, containers are just L3-L3 forwarding in a lot of cases - no L2 domain, conceptually.
TLDR: Spanning-Tree is the previous war. E-VPN + Modern L3 segmentation is the new way.
