Hey @Bogdan_Mind! I hear ya - it can definitely be tricky to go back and forth between the two and learn an entirely new system. We released a lot of changes all at once since we rewrote the entire table to make it more powerful and more performant.
There are a couple posts that might help clarify the changes:
https://docs.retool.com/apps/web/concepts/table-legacy-comparison
https://community.retool.com/t/thread-new-table-feature-announcements/22338
Let me know if you have any questions!