@Lloyd *******
Well, the rule still exists and was never really rescinded. However, all entries were always upon the discretion of an Immigration officer, regardless if showed up on a visa or without. An Immigration officer is allowed to ignore a rule and decide individually. All the recent years, this rule has never really been applied, but this doesn't mean it has been rescinded. It still is posted on many Embassy websites, and the leaflet that passenger got handed at the BKK airport clearly shows it still exists. You might now argue that Immigration is not a part of the Ministry of Foreign affairs, and actually, YES, they are n ot, they are Ministry of Interior, and they can officially make up their own rules or ignore an existing rule.