Well, no..... There are many many, untold items items involved in trade. To develop harmonized descriptions and definitions that can and are reduced to numbers in a database that can then be valued is a big step toward facilitating trade.
For instance if there is a harmonized agreement on the definition of a widget, left handed, HDPE, the NGO agencies calculating the tariff for goods imported into an african or south american country can fairly affix the value.
Harmony means everybody knows what everything is
That’s not how the European Union defines it. Look up “tax harmonization” when it comes to them, just for starters.