I write

WB, I'd say so. The present tense lends a kind of immediacy

….whereas "wrote" might imply a sort of dismissal

No because mom tells constantly and ongoing-ly. But once writ, its 'wrote' or 'written', simple past or past perfect. Unless your writing is in progress, or the writing is mentioned before the writing is in the past - simple or perfect.

Writers often use "I write". One often used to see it in letters. It describes the situation at the time of writing.

I write as bombs are falling and Berlin is burning.

I write this letter with a heavy heart. My dog is dead.

I'm not sure what you mean Bob but I think I must disagree with Mom

Yes, you can use the present simple , WB, but not just for any situation. We use it for momentous, dramatic situations like the ones Contrex mentioned, Dale too.

Otherwise it would sound like an EFL being influenced by their mother tongue.
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-Government officials say they are... (not SAID, though saying in the past)

-Mum tells you to...(not TOLD)
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These two are reported speech and here too we use present tense when the event is current, important, momentous, ... .

Mom tells you to ... may well be something mom says so often that it has become routine/habitual.

Once you're done writing it, you wrote it and it is written or was written.

I write this, Bobsal, to describe to you how you are missing an important grammatical feature of the English language. Grammatical tense is used for much more than just time designation.

Riiiiiiigggggghhhhhhtttttt...........

I'm glad we agree.

Annnnnnddddddd what would that be? Don't toy with us, boyo, tell us everything you know.

Joe(otherwise you come off as as some kind of prig and you are not)Nation

I'll let you handle it, Joe.

Thank you~