Travel and immigration standards

Based on an article in TPM, I looked up the original statement on the newest travel ban (1 February 2020). One of the claims: 

President Trump’s security and travel proclamations have immeasurably improved our national security, substantially raised the global standard for information-sharing, and dramatically strengthened the integrity of the United States’ immigration system.

There's an old American saying: "Don't fix what isn't broken." Let's look at the statement: "raised the global standard" Okay. But from WHAT? Appears to me the "global standard" was raised from a standard that was already satisfactory! 
How many terrorists were we getting on a yearly basis from "Burma (Myanmar), Eritrea, Kyrgyzstan, and Nigeria"? Heck, how many terrorists had we ever gotten from any of these countries? How many did we ever get from "Iran, Libya, North Korea, Syria, Venezuela, Yemen, and Somalia"? Wouldn't we be far more likely to be shutting the door from people trying to escape from these countries?
Of course, there was the typical Trump Administration cluster$%#@ of failing to communicate: "...the additions appeared to take some foreign officials by surprise." Because Trump's people never thought to work out anything quietly. 
Update: And yes, despite the date of the new foreign travel ban, this ban had nothing to do with the COVID-19 coronavirus. ,