Your post is full of misinformation. It certainly is possible to use 1/4 hex bits in the Festool system while still being able to use their proprietary system when it makes sense.
True, the Apex style drivers do not fit, but they do not fit any other drill mentioned so far either. They do fit impact drivers or you can just chuck them up in the keyless. Tell me what is different with other drills regarding this? The Festool proprietary system is an improvement over the Apex system while not excluding the use of the short hex bits within the system. Best of both worlds.
Also, the right angle attachment allows you to use their keyless chuck, thereby allowing any drill bit that could be used in a normal position. Additionally, you can still use their proprietary system in the right angle mount if you want to get into even tighter corners.