In 0.14.1, currently available to insiders, tables will render in live preview. I want to be clear that this is not cell-by-cell wyswyg editor. The whole table switches from reader view to code view and viceversa.
I will close this FR. If you are interested in cell-by-cell editor, follow this other FR https://forum.obsidian.md/t/live-preview-edit-table-cell-by-cell/34110.
Plugins that currently facilitate table input: