General Pro vs Cons

C++

Pros	Cons
C++ features, classes, OOP, etc	Potential issues with framework compatibility
More safeguards for bad programming	Extra work integrating frameworks
Less development time with the advanced features	Potential issues with device drivers
	If issues are discovered later, very difficult to switch back

Pros	Cons
Guaranteed painless use of all frameworks and device drivers	Not as feature-rich as C++
Potentially better performance	More development time for complex features
Closer hardware control
Since team is just starting out, can start simple with C and will be easy to add C++ later

SFSF has extern C defined on its headers.
Should be mostly painless to switch to C++, will most likely need minor changes in implementation
However, it might become awkward to use since SFSF is designed with the limitations of C in mind, therefore, with C++ it looks like we can(should) change some SFSF implementations to take advantage of C++ should we decide to

Potential issues with new and delete operators https://www.freertos.org/FreeRTOS_Support_Forum_Archive/February_2017/freertos_FreeRTOSs_compatibility_with_C_2aa2a047j.html
If we use STL functions it needs to be thread-safe
No official documentation on compatibility with C++
Plenty of community resource however, of other people wanting to use C++ with freeRTOS https://www.codeproject.com/Articles/1278513/Cplusplus11-FreeRTOS-GCC
freeRTOS tasks and callback functions will need to be in C, so another layer of work there