>> “Not to mention that the feast days can’t be properly kept without the Temple and a consecrated priesthood to make the proper sacrifices.” <<
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Proving that you have no understanding of what Yehova’s Appointed Times are all about!
The only Day that had anything to do with sacrifice was Passover, which Yeshua has fulfilled.
The rest of them are purely family observances done in a prescribed manner.
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But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed. If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain. Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.