yes, there are real-world issues for 32-bit ASN users today related to communities. If I'd have to do a greenfield deployment of a new transit network today, using a 16-bit ASN would be a blocking requirement due to BGP communities. I imagine that for a number of years to come 16-bit ASNs will be more desirable than 32-bit ASNs.

Exactly this. I left my former $dayjob at the end of November 2017 at a $hugecompany building a greenfield network at cloud scale. It was not possible for us to use 32-bit ASNs and do TE'ing the way we wanted to. Because it was a $hugecompany, we were able to grab a 16-bit ASN from other parts of the company and use it instead. But we tried 32-bit, and it failed to meet our basic network architecture requirements.
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