Speaking with some others on the team, we all believe this is a valid optimization. The main use was to prevent users from selecting keys that don’t match the desired type. We also make use of them at initialization and before saving, but once cooked, they should not be required.
All of that being said, we are going to look to push this into the engine ourselves. Thank you for finding this and letting us know about it! We do not do much development for BT beyond bug fixes, but this looks like a good optimization I am sure many other would also like to have.
-James