They are nerfed in LHTR, but they still do better than regular bombers. I’d still make sure I was extra aware of how many bombers my opponent had if they had this Technology:

Average IPC damage with regular bombers: 3.5IPC

Average IPC damage with heavy bombers: 5.5IPC

Chance of hitting with regular bombers on attack: 66.7%

Chance of hitting with heavy bombers on attack: 88.9%