The point is not making registration impossible, just harder and more complicated. When you combine it with voter roll purges the play is clear.
Get a biased commission to remove everyone named Jackson or Hernandez a couple months before the election because "there's too many people with that last name and officials might confuse them" or purge a whole district that just happens to be an opposing party stronghold based on a single voter fraud conviction.Do it silently without informing voters, and when they realize they need to register again they have to go through a complicated process designed to make them give up.
Rejecting IDs at the poll booth is actually pretty rare because it's so obvious. Real schemes are a bit more creative.
So what would that accomplish? The Trump playbook asserts that there is a massive conspiracy involving noncitizen voting. Their proposals involve proving citizenship to vote. And now your argument is to use ID that doesn't prove citizenship. Brilliant.