Isn't 'do this in remembrance of Me' a command to keep taking communion regularly?

You are right that 'do this' is a command, not a suggestion. It is an imperative, the Torah-command register, the same voice that fixed the appointed times and the sacrifices. Anyone who softens it into 'reminisce when you feel moved' has thinned it out. Your instinct that Yeshua (Jesus) meant something binding is sound.

And you are right that the table is meant to be kept, not treated as optional. He handed His friends something to do, really to do. The question is not whether but what, and when.

You may already sense the gap the question opens: everyone agrees on 'do this,' and yet the rooms disagree flatly on how often, weekly, monthly, quarterly. That disagreement is a clue that the frequency was read in, not read out.

Here is the move to put down: hearing 'do this' as a free-floating license to set your own cadence. It was not spoken into a vacuum. Luke will not let us miss it. He had sent Peter and John to 'prepare the Passover' (Luke 22:7-8), and He said, 'I have earnestly desired to eat this Passover with you' (Luke 22:15). The 'this' in His hand was the Pesach (Passover) He was already keeping, not a new rite floating free of the calendar.

And that meal already carried its own 'how often,' set centuries before the upper room: 'This day shall be for you a memorial day' (Exodus 12:14), the same word, zikaron, that stands under the cup. Passover is a mo'ed, an appointed time whose date is fixed by HaShem, kept once a year. Into that appointed remembrance Yeshua spoke His own name. The frequency question answers itself, not from anyone's preference, but from the calendar the meal already belonged to.

Do not take it from me. Read Luke 22:7-15 and watch what meal He is keeping, then read Exodus 12:14 and see the word 'memorial.' Ask whether 'do this' set a new schedule, or handed you an appointed time that was already there.