We miss some context about the environment the bench is going to be used in tho. Depending on humidity and room temperatures you might want to protect the wood better and also account that ultimately, it will degrade. If its an always 20 degrees room with no fluctuation in weather condition, I'd follow your advice. If its a somewhat badly isolated garage or something, that the wood goes from 40 to - 20 celcius throughout the year and goes from super dry to wet to dry again then super wet etc.. I'd advise to invest more unless you want to build a workbench every 5 years.