Factually wrong. Third party chargers get full speed. MagSafe requires the new PD3.0 profile while most old chargers were stuck at PD2.0. Zollotech did an update video showing the new Anker and Aukey 20w charger works: "As long as you have a 9V/2.22A charger, it'll charge at full speed"
Apple isn't forcing people to buy their new chargers. Any third party charger running PD3.0 with at least 20W can do full charging.
Combine with the fact that MagSafe works with other Qi devices, MagSafe is far more compatible than a lightning cable which means MagSafe is more than likely going to outlast the lightning standard in supporting many devices in the future.
It's environmentally friendly.
No. As I mentioned above, all PD2.0 chargers don't support the 9V 2.2A spec. PD2.0 has to use the next power profile down. This is why an 87W Apple USB-C charger won't charge at full speed because it doesn't have the 9V 2.2A spec.
Please educate yourself on what PD3.0 is.
Factually wrong again. Any PD3.0 >=20W charger works. As noted above, my Anker 20W charges at full speed. I think you've been brainwashed by the typical clickbait articles complaining about full MagSafe charge speeds.
Apple has been shipping USB-A to Lightning cables since 2013. That's
7+ years. Apple continues to sell USB-A to lightning.
On the otherhand:
Apple released the 87w charger in 2016 and replaced with 96w only
3 years later. 87w is no longer sold by Apple
Apple released the 29w charger in 2015 and replaced with 30w only
3 years later. 29w is no longer sold by Apple.
Apple released the 18w charger in 2018 and replaced with 20w only
2 years later. 18w is no longer sold by Apple.
Tell me which is more consistent?
Disagreed, considering your thesis was based on incorrect information as noted above.