I was told the same and when i questioned why the reason given was that disabled people who sit in the front row miss whats going on. I did turn around and point out to the steward there was no one behind me for at least the first three rows but I got the usual from the three big knuckledraggers who caused more of a obstruction than any fan stood in the way could.
Oh before I forget there not stewerds any more they are now stadium care staff. FFS
I do understand the idea but its the usual thing thought out by someone who has never been to a match.