On a multiselect, each option can have a color. The autocomplete (when typing on a desktop) or color options to tap (when on mobile) is also very visually pleasing.
If you convert it to a record to another table, both desktop and mobile change quite a bit. You have to manually type out a few letters to get options. They’re not color coded. It’s just way different.
I have a very important multiselect that I’m downright afraid to convert. It’s too important to lose those (seemingly small) features. So I have another table which I manually update when I add a new option to the multiselect. This is less than ideal. It means I can’t get a count of how many of each option exist across the table.