Provide the option to use decennial census data, especially 2010 Census data.
2010 Census data is necessary for federal grant eligibility for rural communities, for example the USDA RCDI application requires use of a specific 2010 data set.
Also, the areas available are way too large to be meaningful. Rural communities are invisible at the current data level, for example. If you filter a specific address, you get results from a different state, far away, along with an area, like a census track or block group that is hundreds of square miles larger than the community you are searching for. It seems like the data blocks available are only relevant for heavily populated urban areas.
Ken Schwencke commented
I'd add on to this and say it would be super useful to download census 2010 (or 2020!) slices for a defined area using CR's interface
This is a reasonable idea, although some more information about why its useful is welcome. Are you looking for block-level data? or just for the specific decennial figures for certain cases?
Would you want it just in table form? Or would you somehow want to see the profile pages also integrate decennial data?