Andrew Sarangan wrote:

Also, why are the entry
procedures so important? Is there any example where an incorrect entry
procedure would have caused an accident?

My guess on this question is....

You don't bump into someone in the soup doing a proper entry.

The proper entry makes it so that ATC can anticipate / predict your next
move, knowing how the entry to the hold from your direction of travel.

Just like working in the pattern at an uncontrolled airport, you would
want people to enter the pattern appropriately to keep things neat and
orderly.

Don't want some one doing a right hand pattern at a left hand pattern
airport....

Allen