The problem is - the connector is significantly different. The L-shape for a magsafe connector is great, but the connector will also pop off easily (which is both good (protects the hardware) and not-so-good (wrong movement unplugs power instantly). Now, the USB-C connecter is not so easy to unplug, making the power connection more secure, but also making the connector or plug significantly easier to damage. The almost-flush connector that you would like to have, would still have that stronger physical connection, without the easy release of the magsafe connector. The possible torque available from that right-angle connector would mean (to me) that you would need to be more careful that you don't accidentally yank the connector from a really bad angle, leaving more potential for damage to either the adapter, or the MacBook.