I'm not aware of any shingle manufacturer that prohibit open valleys but there's things far more seriously wrong with the roof on that photo than the fact that it has an open valley. The valley is lined with laminated shingles, shingles that are not intended for such low slopes, nor even for curved surfaces. Even without an establishing shot, I'd say that roof has a serious framing error. The central area within that photo would have been better framed with a flat roof and a single membrane roofing material, such as Mod-bit, EPDM or TPO. Until it's corrected, that area of the roof will always be a problem. Problems that are built into a house are among the most difficult and expensive to correct.
source https://www.inspectorsjournal.com/topic/18792-asphalt-shingles-in-open-valley/?do=findComment&comment=171996
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