I suspect there’s no good reason to upgrade from M2 to M3. Nonetheless, I did it, and if anyone else is in the same boat I was, I encourage you to look at the trade-in values that Apple is offering for M2 MBPs. They offered something like 90+% of the out-of-pocket price I paid for the M2 six months ago, so it was basically a wash on the trade.

I don’t in any way “need” an M3 but this was a particular painful turn of the ever-rotating upgrade wheel, and the generous valuation on the trade certainly took some of the sting off.