Might be they need both as some data centers/end users will have OSFP ports and others QSFP? Then maybe a matter of changing the hardware for QSFP as its uses less power & prolly worthwhile (like LED lights).

This is a paragraph from the link below offers that offers more comparatives? Sounds to me that QSFP-DD is the way to go and Poet is barking up the right tree in power & performance. 

Generally, the power consumption of QSFP-DD is 7-12W, while the OSFP can reach 12-15W. The lower the power consumption, the better the performance of the transceiver. Unlike the QSFP-DD, OSFP can’t be backward compatible with QSFP+/QSFP28 since it has a larger size than that of QSFP+/QSFP28.

https://community.fs.com/blog/differences-between-qsfp-dd-and-qsfp-qsfp28-qsfp56-osfp-cfp8-cobo.html