Anchoring .... Back and Forth

Yep, And I criticize them also. Weight savings (anchor, rode and larger windlass), cost (anchor, rode and larger windlass), fashion, on a dock usually every night and younger skippers may not know how to use a second anchor.
I'm still with Pascal, a proper rigged single anchor should work in most needs. And, it works for us. However, some times on more open water I have dropped a second hook. Bahamian or just a large spread pattern has helped. (Not a storm setup, that's another more serious discussion).

Our pulpit is the single anchor design from Bertram with a BA Bruce anchor. Horizontal windlass has two gypsy's. We have 3 rode sets available at anytime on the bow. The Fortresses (#2 & #3 sets) are folded down in the forward deck locker (3/4" wrench taped to shackle). Still looking for an original Bertram dual anchor pulpit.

I also commented earlier about Old Pharts idea and phrased it wrong (again); Not a drone, but a drogue. I'm still looking forward to experiment with that idea when in a toss between wind and current.

Anchor manufacturers have simple boat size ranges per anchor size which are always off by at least one size. If possible I go two size over the recommendation, as long as the pulpit / roller can accommodate it.

It also depends on the boat and how where you use it. High windage (beam or enclosed flybridge) will definitely require a larger anchor.

Most all anchors also are rated or list their holding power (in lbs) in addition to boat size. The windlass strength is also a consideration in addition to the pulpit and roller. Whether you have all chain or just a short piece of chain and nylon rode makes a major difference as well in holding power.

For example:
http://www.rocna.com/sites/default/files/sizing_graph_pounds.jpg

http://www.fortressanchors.com/selection-guide/fortress
(click on selection guide)