For most generation Y they have same thought like you saying stay back mean inefficient. If you are in corporate especially big MNC, you will find out the company giving lots of workload which we hardly finish the task before 6pm. That's why some MNC allow employees to take their laptop back and continue work from home. I am not asking the youngster to stayback but there are many work remain pending and yet they still insist to go home on time.

I do not agree to stay back OT however finish the task within the day is an obligation as employee are receive wages from company to do their job right. Nowadays youngster asking for higher salary but less workload and go home on time, what about the senior when their salary is just about 10% - 20% who have higher workload need stay back and more stress. Do not tell me the gen Y is guarantee more efficient than previous gen, if yes please prove it with evidence.

e.g. admin staff general comparison

fresh grad demand for 2.5k, 1 experience
senior current pay RM 3k, 5 years experience

So how the senior will feel when they contribute more than the junior yet the salary was only 20% higher than fresh grad. Senior are proven capable to work but fresh grad performance is remain unknown until they stay more than a year to justify.