If one brought Korban pesach and didn’t put on tefillin would he put it on after since it’s still midday or do we say since it’s chag hapesach biblically then it’s like chol hamoed? And would the same apply today even though there is no Korban pesach? (What we refer to as pesach nowadays is really chag hamatzot.)
It would seem that the איסור of חמץ on ערב פסח cannot be completely considered an ״אות״, because the reason for it is seemingly not necessarily to be a reminder of ״יציאת מצרים״ but rather as a result of the fact that the קרבן פסח is brought then, which is only a preparation for the night of פסח, being that you can’t bring a sacrifice by night
Also it’s obviously not exactly like חול המועד - there is no חיוב שמחה, and you can’t bring the קרבן ראי׳ and חגיגת הרגל then either, and even the איסור מלאכה is more lenient and only מדרבנן because of the קרבן פסח, no הלל or יעלה ויבא or anything special in שמונה עשרה.