Why did they say it was bad.?

Post the reasons and we will tell you if they talking crap or not.

I had mine done and it was the way to go, makes the gasket sit flush when fitting the head and stops the risk of the head distorting under large load.

Everybody is going to have a mixed opinion. Steve Scott advised me to do it so I did when he built my engine. If its good enough for him then it was good enough for me.