its all down to buisness, people could make SD cards in droves for higher storage density but then that would ruin the market and kill margins, so no company will do it.
same reason why 8tb SSDs are insanely expensive and why HDDs get very non-linear in price as you go above 10tb. our global economy has frozen all storage costs because everyone wants high margins, nobody cares about high volume.
Its the exact opposite world we had when DVDs and CDs were a thing thats for damn sure.
also all the people saying its for technical reasons are wrong, a 40tb microsd based SSD would still be better than a HDD, even if it might be slower than modern full size flash chips
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