Almost always it’s maximizing profit margins rather than anything else.
they operate 100% on profitability, not what's technically feasible. They are extremely focused on making money. Yes, there is a reason after all.
I recently went on a 5-day trip and forgot to bring the charger for my M2. The first day I thought I'd have to rush around and find one. By the fourth day I still had 8% and then finally realized I could charge it via USB-C instead of magsafe.
Just 2 would be enough. Which seems like a basic feature their competitors are are capable of supporting for a very low costs.
They in fact are competing on checkboxes, specifically they are probably using this limitation to upsell theirs more expensive models.