This is very true; I think the state of America's churches would be vastly different if, for a whole year, every church did a sermon from James.
Indeed, I think we'd restore much of Christianity's name/reputation (which is really Jesus's) if we all personally did an intense study on James.
Just look at the start of ch 5:
Come now, you rich, weep and howl for the miseries that are coming upon you. Your riches have rotted and your garments are moth-eaten. Your gold and silver have corroded, and their corrosion will be evidence against you and will eat your flesh like fire. You have laid up treasure in the last days. Behold, the wages of the laborers who mowed your fields, which you kept back by fraud, are crying out against you, and the cries of the harvesters have reached the ears of the Lord of hosts. You have lived on the earth in luxury and in self-indulgence. You have fattened your hearts in a day of slaughter. You have condemned and murdered the righteous person. He does not resist you.Imagine what work would be like if employers refused to comply with withholdings, on these religious grounds. (Indeed, I view withholdings as the chief evil of our income-tax system [followed closely by its disproportionality]: for it is either coercing the employer to commit fraud [not paying what he promised], or it is theft from the worker.)
In the early days of AA before the Big Book was written, the pioneer members would read the book of James every day. All 12 of the Steps essentially come from that book.