Derech hamelech
“I am not telling you halacha l’maisah I’m just telling you what I think. I assume that the mitzvah of tzitzis is the same as the mitzvah of tefilin. Were it not for that Rov who went around we might only be putting on tzitzis once a day by Shachris like we do with tefillin today.
Me’ikar hadin we are supposed to wear tefillin all day, but we don’t because of guf naki. But tzitzis doesn’t need guf naki.
That’s all I know.”
Then you know very little about tzitzis, because tzitzis is totally different than tefillin, according to virtually every rishon and every acharon that you’ll find.
About wearing tzitzis at night. There is a ptur on tzitzis at night, see the sugya in shabbos. Some chassidim wear tzitzis at night though, based on kabbalah.