But they used to include the 14-50 adapter. It is a marketing ploy because Tesla does not want you to put in a NEMA 14-50 outlet, they want you to buy the Tesla Wall Connector and pay the $500 which you did.
They havent included it for quite some time, but the thought that "its a ploy to get people to buy the wall connector" is pretty strange in my opinion. Of course, everyone is entitled to their own opinion.
The car used to come with not only a 14-50 adapter but a couple others. There was very little chance a person would use them all, so the others were just there as a convenience. Back then (when I got my model 3 in 2018) the car was more expensive than it is now.
It makes a LOT more sense to remove $100 worth of adapters from every vehicle, and then have the person choose to buy exactly what they wanted / needed. There does not have to be nefarious intent by tesla to try to "force" anything, just a desire to lower the price of the car, and remove a bunch of stuff that cost them money that people were not using. I have a bag full of adapters in my trunk I drive around with that I have never used.
Now, if you want to talk about the removal of the clips in the frunk, that seems to me to be basic cost cutting / de contenting. Even the removal of the homelink as standard makes sense because tesla has to pay a license fee for each car that has it installed. Where tesla messed up with homelink is not having it be a selection in the ordering menu so you can order it with the car.