You don’t have to do it, people should know what the genbank accession is to be able to look it up - personally though, I do like it when all the info is in the observation fields, if I need to quickly copy something to do a BLAST comparison it makes it really easy without having to look it up.
Other people probably have their own preferences regarding what to do, I’m sure.
If you’re processing through mycomap (or move that direction) there is a button that will export the data automatically to the appropriate mycomap observation fields (assuming you have the sequence connected to the correct iNat observation)- you can also just do this for the entire project at once if you have multiple sequences you’re going through and validating
There’s a few extra observation fields here added, of course, but that ‘import to inat’ will automatically fill out DNA barcode ITS (or maybe other gene regions too if relevant? I just realized I don’t know if it will LOL), MycoMap BLAST results, Reads in Consensus (RiC) (if you’re doing Nanopore sequencing), Sequencing Technology, and Trace Files (Raw DNA Data).
There might be a few differences, depending on gene region/sequencing tech, but overall - its handy.