I often see this trend on GenBank assemblies where you have older chromosome level assemblies and then newer PacBio/illumina assemblies which are not.
Are these older assemblies actually better, or do we have more stringent requirements on what to call 'chromosome level' now? I would think with the improvement of technology the newer assemblies would be best.
In this case I'm looking at the platypus assemblies. Here is a 2007 Washington University chromosom level assembly: https://www.ncbi.nlm.nih.gov/assembly/GCA_000002275.2/
And here is the latest 2018 BGI scaffold level assembly done with PacBio/illumina: https://www.ncbi.nlm.nih.gov/assembly/GCA_002966995.1/#/def
Another example: African malaria mosquito from 2006: https://www.ncbi.nlm.nih.gov/assembly/GCF_000005575.2 Then contig level from 2016 with PacBio: https://www.ncbi.nlm.nih.gov/assembly/GCA_001542645.1