use of isochronous mode

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Hello,

I read the USB spec, understand when to prefer bulk vs. isochronous pipes. 
My usecase requires controlled jitter & guaranteed bandwidth.
But when discussing this with multiple peer engineers, rumor goes isochronous mode has 'issues' (sic), they advise me against using it altogether.

But when I try to pinpoint, I find nothing: 'isochronous' does not require more patches on this mailing list or in the git history; no panic stories on forums; commercial devices are few but do exist.
 
Does the Linux USB implementation supports both equally well? And also the scheduling of a mixture of both pipe types? For both USB 2 and 3?
Do you have an idea why many commercial devices (e.g. AV applications) still would go for bulk?

Thanks a lot & kind regards,
Yves
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