I’m also running 720 and feel like that size is a sweet spot for me.
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I’m going from 178 to 175. Old
I recently watched some vintage coverage from a XC race in the early 90’s…while I think the current trend of ultra-wide bars is over the top, watching these legends roll around on comically narrow HB was pretty funny.
And trees.
Yes, wider bars can give you more leverage when riding, and that’s not a bad thing, but hitting trees with your knuckles is a potential career ending incident.
My MTB bars are 665, and fat bike are ~705. I also use bar ends on both bikes as ‘bark biters’ and they also can help climbing. 
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I’ve been on 720s for the past two years and have never felt like I’ve ever needed more width.
As a matter of fact, I could see trying 700s or 680s for most of my riding… I think I might even have an alloy bar somewhere I could cut down to try… 
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After I bought a new mountain bike, I cut off 10 or 12cm. I was questioning whether I was doing the right thing but my wrists were hurting. I honestly might go even narrower.
I never understood where all the leverage from wide bars is used. Maybe that is my roadie background speaking?
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