@sechel
this is one example that if you think over the question, my answer etc, you see how a bit more looking into the sugya you have your “shtarke kashe” answered
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דבר ברור ומפורש בתורה שהיא מצוה עומדת לעולם ולעולמי עולמים, אין לה לא שינוי ולא גרעון ולא תוספת,
Thats the lashon harambam ,sechel is quoting.
Three things can not happen to any mitsva of the torah
1] Shinuy
2] Gira’on
3] Tosefet
Sechel agrees that ,at least still in the times of hazal,, the nature of the mitsva of Talmud Torah was shakul keneged all other mitsvot .
So Sechel agrees that this mitsve as it was given by HKBH to Moshe , WAS shakul keneged all other mitsvot .
Sechel also says [and here he seems to be supported by the pashute pshat in tanya] that at a certain moment, there was a ‘change’ , and this mitsve ‘lost’ its privileged status , is ‘demoted’ and from now and onwards it is only a ‘regular’ mitsva , not shakul keneged all other mitsvot.
Sechel wants us to believe that this change and this demotion , is not included in the definition of Shinuy, nor the definition of gira’on.
Nu , Nu …..