We have implemented a change which brings our matrix entry system into line with LaTex, as well as saving some keystrokes.

From V23.12.5, you can now mark the end of a cell with a single ampersand, rather than a double.

table(1&2&3\\4&5&6) instead of table(1&&2&&3\\4&&5&&6)

Any table/grid/matrix you have created with the old, double ampersand system will still render correctly.