Any reason not to use runner/girth hitch anchor?

I have been almost exclusively using a dyneema runner equalized between three pieces and girth hitched to master point for my trad anchors lately. I feel like I see more people using cord for their anchors than this method. I am yet to have an issue with being able to equalize or not having a long enough runner. Is there any reason to diversify anchor styles, or is this totally fine? Thanks!

If the only tool you have is a hammer, you tend to treat all problems as a nail. 

Nothing inherently wrong with using a long sling and making a girth hitch master point. But it’s also worth having a variety of tools available to you. 

For example, if you have three good pieces but they’re close together, using a quad sling and girth hitch will often result in a master point that’s too low to be comfortable. In this case, it’d be worth having a technique that would allow you to use those three placements and still have a nice high master point. Just the first example that comes to mind. 

Pat Marrinanwrote:

I have been almost exclusively using a dyneema runner equalized between three pieces and girth hitched to master point for my trad anchors lately. I feel like I see more people using cord for their anchors than this method. I am yet to have an issue with being able to equalize or not having a long enough runner. Is there any reason to diversify anchor styles, or is this totally fine? Thanks!

You mean instead of a similar-length cordelette? No. I think modern, long, dyneema runners make great anchor options. And you can always use the rope if you need more length. 

Totally fine. More expensive to bail on. 

It's wise to have energy absorbing elements built into your setup. Climbing rope is designed to absorb energy. Dyneema is not. 

https://youtu.be/Vrgadjo9niY

The video title: 'DMM Technical Video on Slings at Anchors". Seems to directly address the original posts' query.

Will McCarthywrote:

It's wise to have energy absorbing elements built into your setup. Climbing rope is designed to absorb energy. Dyneema is not. 

That’s uhhh…. sort of why we have a dynamic climbing rope attached to us and the follower. Anchors don’t need to be dynamic.