makes entire institution of Yom Tov Sheni by Shovu’os even wishier washier than by Pesach & Sukkos
Poskim say it actually might be more stringent, since it was instituted as a vaday rather than a safek (although I’m not sure I understand that; why should a “lo plug” be more chamur than the original din?).
Either way, I agree with LF that the term “wishy washy” should not be used in this case.