It's not that simple. I am an electrical engineer. The coil design for Qi is different than that of MagSafe. In order to get all the benefits of magnetic alignment and 15W power transfer, Apple had to go their own way. This then means that MagSafe doesn't also support max Qi charging speeds because it is more focused on max MagSafe wattage. Apple wasn't interested in only solving the engineering problem for Qi, they wanted to go beyond this and add magnetic charging.
If everyone was less impatient, they could see that in the long run as third parties develop more Apple certified MagSafe car charger options, there will be some great chargers that can simultaneously hold your device and charge at max wattage. Up until now this required a special case or putting a magnetic pad on the back of your device which would mar aesthetics, something Apple is loathe to do. Apple didn't want to let this all out in advance and spoil the surprise of MagSafe, so that's why it takes time for third parties to develop. The same was true when Lightning came out, and today there is a vast ecosystem of Lightning accessories. Give it time.
So this is not a malicious act by Apple. It's an attempt to create a better widget that can allow for both holding the device and charging it at a pretty high wattage. Almost as good as wired. That adds value and should cost more. If one does not like it, one can always charge with the wired cables one already owns.
If one looks further in to the future one can see that the ultimate goal is wireless charging and data that are not even dependent on a close proximity inductive charge. Particularly in car, this makes for a super safe experience with CarPlay wherein just having the device present in one's pocket or bag would automatically activate wireless charging and wireless CarPlay in a handsfree mode, thereby encouraging one to focus on driving and thus solving the big problem of distracted driving.