Main benefit is that you don’t need to install anything and there is no risk of any versioning interactions between the table view functionality and packages you might have installed as a user.
In terms of UI, there is a lot of improvements we could do 
I think eventually we’ll probably want to do something like https://github.com/jupyterlab/jupyterlab-data-explorer, i.e. have a notion of a data set in the extension and UI, and then have the ability to do various things interactively with that (show in a grid, use something like lyra and voyager in VS Code etc.)