The Galaxy Tab S9 Ultra is huge in several regards. In our test, the Samsung tablet scores with its slim construction that looks even more spectacular due to its size. Also aside from the case, we cannot find many negatives about the Tab S9 Ultra. https://www.notebookcheck.net/Test-verdict-on-the-Samsung-Galaxy-Tab-S9-Ultra-Ultra-slim-tablet-improves-in-the-details.755022.0.html
By the time you've got the super expensive keyboard you might as well buy a laptop/convertible.