You can see all of the updates our team already released over the past year here:
https://www.simplify3d.com/products/sim ... ase-notes/
In fact, they released more updates last year than any other year I can remember, so there has been much progress.
Right now, the developers are busy working on their next big feature update. The bigger updates take longer than small incremental releases, so it is normal that there will be a longer gap before those are finalized.
In the meantime, if there are any specific features you want to see, be sure to vote for them in the Feature Request sub-forum. Our team uses that information to prioritize what changes to work on next.