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Cycologist
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Can't see much in your photo but a lot are dented in for chainring clearance.
 

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Hitching a ride
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It's so they can have a short chainstay on a bike with big fat tires. You might notice that if it were higher, there is very little room between the chainring and tire.

Other strategies are (for metal bikes) having that junction machined as one piece so it can be thinner, then welding it to a tube after it clears the chain ring. Or, putting the ds stay above the chainring like the Trek Stache.

The Super Boost 157 strategy is to push the cassette out, so then the chainring can be pushed out and give more clearance for the stay.
 

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It's so they can have a short chainstay on a bike with big fat tires. You might notice that if it were higher, there is very little room between the chainring and tire.

Other strategies are (for metal bikes) having that junction machined as one piece so it can be thinner, then welding it to a tube after it clears the chain ring.
Marin Pine mountain is an example of this.

Sent from my Moto G (5) Plus using Tapatalk
 

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