Hi,

well overall the product is right now designed to be simple to use and it sometimes leads to the lack of possibilities you may have when you would like to choose which items you would like to delete and which not. We will probably make it more detailed in the future but right now you can select just the first level of details within the particular categories displayed in System Junk or any other cleaning feature.
With regards to the limit actually there is a limit. We do not offer the most recent restore point within the results so it is prevented from being deleted. See the attached screenshots for more details.

Thank you!