Thanks Scott and Justin! You are right.
However typically it's best in GMB to fully spell it out. (I go through all this in the other course you have not taken yet.)
Then all new citations you build should match exactly what's in GMB, and especially the NAP on the web site should match.
So it's CRITICAL to get NAP right in GMB first. (That's one of the things I was referring to when I told you about how GMB and onsite SEO are all intertwined.)
So if you, doing onsite SEO and citations just match what the guys that did the GMB page put in there. OR if the client had it wrong to begin with and your GMB guys don't know how to do all the research to be sure it's right... Then you do all your work - if you just match incorrect NAP - essentially you are wasting your time and building everything on a broken foundation.
So getting NAP right in GMB to begin with and then being consistent, is still pretty much priority 1.
But what the guys I think are saying is that if there are minor inconsistencies already out there, like standard street abbreviations out there OR if a citation source abbreviates, no need to sweat it. Google is now pretty good at figuring it out. (They weren't great at it in the past, but are now.)