User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-45204017-20210106112331/@comment-172.56.23.115-20210106210043

Basically, according to Tupka217, Legacy relied on outdated code and was broken on the inside. It was beloved by everybody though, except for the devs who had to go “under the hood” as Tupka put it everytime something broke.