Unity3D Game Dev Interview

Interviewer: What is reflection and why would you use it?

Me: Gives overview of system and how I've used it in games before.

Interviewer: Sorry that was a trick question, Reflection is really dangerous and slow. You need to go back and learn the basics.

Me: ???...

A huge portion of Unity is built upon Reflection based systems, the entire Monobehaviour base relies on it. Their events system uses it, animation and timeline. I guess their team needs to go back to the drawing board.

How is this person a senior dev?

I made an account just to rant about this:

Currently working for a multi billion dollar company and this is the code some wanker decided to write! Now I get the pleasure of reading through and debugging it :D