They are nice, but they won't work with my factory OBDII EFI. because of the tone-ring that's an interagl part of the flexplate on Magnums. Adapter plates have been the go to method for a long time. Really, they were the only game in town, but they have their disadvantages too.
Yes, the converter issue has been a pain, and it would have been nice to get the right converter the first time, but this is a relatively new way to take advantage of the 200R4's without using the adapter plates. I'm sure there is some trimming involved with all the plates too.
Also one has to realize, when using the adapter plate kits, you have to use the 3 mounting lug GM torque converters.