The compendium has a filter/section that will list all the rollable tables available from your purchases, yet sadly they are not built into roll20 for use, and there are still some that are missing the "rollable table" tag and don't appear when filtered i.e. Madness, Wild Magic, Trinkets. They are tedious to build with a pop-up window for each item of the table. Macros and scripts are very much copy and paste and you are done, but the tables take a lot of time to build. A person could build them in one game and then import them to new games that too is time consuming. Benefits to having a repository of rollable tables easily imported into a game would be: New GM's would have easy access to tables they might need, or not know about. When an unforeseen event happens a GM can quickly access a table for the players to roll on. Different community/homebrew tables become easily accessible for GM's to easily use or experiment with. Cut down GM preparation time so they can concentrate on the story more. Yes you can just roll a die and look at a table and read the results over the voice chat to the players, but this is roll20 and players, especially newer players, like to see results on their screens.