I would like to apply theme-grid to individual groups in a survey, rather than the whole survey itself. Often, there are only a few questions in a longer survey that I may want to consolidate onto a single line, this is where I would find this option useful.
This could potentially help to work around the incompatibility of theme-grid and table-list in the same survey.
Setting theme-grid on the entire survey adds borders to every question which are distracting. Alternatively, if we could set the borderColor property in the body::esri:style column it would be helpful (see separate idea here)