The purpose of the anchour is to hold the chain and teh purpose of the chain is to take up th eslack whilst riding at anchour and thus it is the chain that does more work than the anchour.
If you are relying on the anchour to hold the boat and letting a mooring line go taught, the wave action on yanking teh boat will either break teh mooring line by snapping or else jerk the anchour causing "crabbing" of anchour to leeward.
With regard to Yachts which have more of a TUG jerk on the line due to weight and windage, the general rule when flaking out anchour chain is 3-5 times max depth (including Tide please). I would be inclined to leave 5, anymore than this is possibly being unkind to other neighbours.
Obviously one uses their common sense which is all to uncommon.
You do not do this under impending gale as you couldnt leave enough, you would need to find sheltered anchourage or in the case of bigger boats, head out to sea and ride it out.
In any event, there has been much written and more to come about this aspect of seamanship. Finally, ones choice of anchour depends very much on the type of floor. most boats shold accomodate for Sand and Rock (two different anchours, not at the same time). changing just the anchour with a maused or non loosening shackle. Aways have plenty of chain. It makes great ballast also and can be moved to suit boat ballast when required.
Finally, if using a collapsing anchour or grapnel type, do be careful when burying in sand that Barbs are not going to expose to people. It does not take but a small wave to wash one free or exposed.
The Sand plough (a small one with)"your same chain" is most useful for many of these uses.
Thats my lot (my experience is more to do with yachting than ribbing)