A jersey with no reflective elements is perfectly fine if you only ride during daylight hours. Many race-oriented and fair-weather recreational jerseys skip reflective details to maintain a cleaner look, save weight, or reduce cost. If your rides are always in sunshine, you won't miss them.
However, no reflective elements means zero visibility enhancement in low light. If there's any chance you'll be caught out at dawn, dusk, or after dark—even occasionally—a jersey without reflectives is a risk. Don't assume a bright-colored jersey compensates; fluorescent colors help in daytime but don't reflect headlights at night the way reflective material does.
If you commute, train early or late, or just want versatility for unpredictable ride lengths, consider at least minimal or moderate reflective elements instead. Save the no-reflective option for dedicated daytime riding.