Currently, multi-selection box could provide many available items.
However, the user selects too many items than expected sometimes.
Since we don't have any choices, we make it failed in "Step" when too many items selected.
If it could be blocked in "Specify Build Option" page, abnormal build will not be triggered in our case.
It means that it helps to reduce unnecessary system resource usage.
We can see 'Min Value' and 'Max Value' in "prompt as numeric input" of variable prompt setting.
Both of them would be helped.