Question

modern technology is boon or bane?

Answer 1

both. it depends on how one uses it. 

Answer 2

I would say they are both because of the following reasons

Boon
it is a boon because 
1) it can do the work of 50 men together 
2) it  can reduce stress on laborers 

Bane
 it is a bane because 
1) it might cause reduce the rate of productivity in humans
2) it can cause destruction if in wrong hands