Display a warning to the user if the lack of free RAM. (Denied to allocate memory)

In Windows, if there is not enough RAM, it displays a warning to the user. Also, programs may not start for the same reason. As I understand it, ROS always tries to allocate memory, even if it is not physically possible. Is the system better to display BSOD than to deny the program the allocation of resources? Failure to allocate memory to the program will avoid many potential errors and crash of the system. In my opinion, this function can be disabled in debug mode. But in the normal boot mode it can give great stability to the system.