Sending a thank you email after an interview is such a bad habit we have made during interviewing
After every interview people are expected to send a thank you email.
My company encourages this behaviour. Coz they think that employee has manners or some rubbish. I dont see the point.

I usually write back with a thanks and add on open ended questions asking if I could have answered any questions better. Most do respond and it can be a good way to improve for future interviews.