Is there legitimate (scriptural or customary) justification for the practice of "Tithing" in modernity according to recent Protestantism?

Tithing was known in the ancient world, adopted by the Patriarchs, and practiced by Pharisees under the Law of Moses. There was the mixed positions taken by the Reformers of Protestantism. (See https://christianity.stackexchange.com/questions/62509/according-to-reformed-theology-what-is-the-doctrinal-basis-for-belief-in-new-te) But has modern Protestant belief systems maintained the Reformers' positions? Or has modern research and manuscript discoveries altered that traditional belief concerning tithing? There are several old books that present the History of Tithing from ancient times (pre Patriarchal) up to the 19th century British era. [**The Sacred Tenth** by Henry Lansdell, London, 1906; **The Law of the Tithe** by Arthur Babbs, New York, 1912; **An Historical Vindication of the Right of Tithes** by Thos. Comber, London, 1682] But what would they write concerning the "next chapter" in Christian history in regard to tithing (The twentieth, on to the twenty-first century)? What is the scholarly, biblical opinion today? Is it at all controversial? Is it considered optional? Has it been replaced by "free-will" gifts?