As I wrote before: because it makes no accounting sense. Your original question was about displaying a balance sheet for a defined time period, like a profit and loss statement.
Features will never be added that contradict fundamental accounting principles, now matter how easy that might be.
You have not said what report you are referring to. But that really does not matter, because the checkbox for Amounts are tax-inclusive has nothing to do with whether transactions are included on reports. That checkbox only controls whether the tax amount is added to the price of the item or is already included in it and has to be backed out.
Transactions involving various tax codes can be easily reviewed in the Tax Transactions report. That is what it is for.
A time-restricted balance sheet will not provide that information. But in the Sales Invoices tab, you can sort by date and count or export. Depending on your date format, you can get the result directly in a Search. For example, if your format is DD/MM/YYYY, you can search for “03/2018” have get a list of all invoices from March 2018. At the bottom of the list, the Export (2) button will tell you 2 invoices were found.