All hymns include some repeated notes. If many repeated notes are present, and if all are repeated as written, a choppy effect may result (see green box). Also, playing repeated notes wherever they happen to occur may cause "false accents"--accents where they are not desired (see blue box--a false accent occurs on beat three of measure 9).
Some experts suggest that all repeated notes be performed as written, with no tying. This may be effective under these circumstances:
However, this lesson relies on this premise: tying some repeated notes may result in an organ arrangement that is more satisfying musically.