I didn't realize tincture could be made so quickly but that does make for a quick method. I see some tincture recipes that say it needs to sit in the freezer for weeks lol. This is almost the same way Rick Simpson oil is produced. I think it calls for 99% alcohol. Soak it for a few minutes, strain it, and cook off the liquid but I am sure you already know all that.
Yeah for the ones where you evaporate off the alcohol to make honey oil or shatter, etc., it is better to use the 99% isopropyl alcohol. For a tincture that you will drink or take sublingually you want grain alcohol (or any other form of super high proof alcohol, you can find a cane sugar 190 proof alcohol as well). Even just leaving these to soak for only a few hours, my wife reports that the tincture is noticeably stronger than what she bought at the store ($40 for 1 oz bottle at the store!).