Reply To: Can the severity of a sin be learned from the severity of the punishment?

Another relevant mareh makom (though not a rayah by any means)
The mishna berura in intro to hilchos shabbos says how severe shabbos is.
He proves this from onesh. But he doesn’t say case closed that is how severity is determined, he shows other ways that shabbos is more chamur. Because severity of an act is not solely determined by onesh