KEep in mind that the features you've mentioned are not gone for good...
Threads release date was pushed back so many times that once they brought the product back from being ultimately vaporware...
Threads7 was completely rewritten from the ground up, so not all features from both products (or from feature requests) where (or rather could be) added in without pushing the release date back yet again which wasn't a possibility.
The new features that are being added are old ones that where in both products, as well as some new ones to play catchup with long awaited feature requests and other products that've had them for eon's.
