My view is the opposite: RAM isn't strictly limited since computers use virtual memory. Generally speaking, if a specific workload of various applications exceeds the physical memory the computer pages to swap (on disk). As the physical memory fills up performance will reduce a bit due to moving stuff to/from disk. The actual performance degradation today with our super-fast SSDs is far less than it was back in the spindle-HDD days. Plus you can close a couple apps you're not really using, though they'd likely be swapped and quiescent anyway.