Hello,
I know the holding approaches are more for light aircraft…
Let me not agree with this sentence. On other side, holding/s can be executed mostly manually with AP and other data help so your practice/test can be most required than follow automatically holding pattern as is published. I now also answer to you some thing, every NAV/DATA DB needs then be actual also with every NAV/FIX holding pattern in case it actually has because it has actual heading, distance and side, also inbound/outb.