Unfair labor markets is the problem, IMO.
When other countries have industries protected and nationalized by their government, it’s not possible to compete with them because they playing field isnt level. B&S mismanagement could be a bigger or smaller issue that contributed. Its like 2 football teams playing each other on a sloped field, but one team always gets the downhill direction to play, and the other has to play uphill
Failure to adapt can lead to demise, but that would involve leveling the playing field or moving all production to China just to get close to a level playing field.