Well there is the usual schedule. 6 months between patches and 10 months after final patch. As a lot of raiders will tell you a 6 month wait is optimal because raid tiers need that much before they get boring. Less than that and it is rushed. It is why MoP had more frequent patches but not all of them had raids. To keep this schedule up.
Now then. With no delays it looks like:
9.1 -six month wait-9.2-six month wait-9.3 -ten month wait-10.0
or
9.1 - six month wait- 9.2 - ten month wait - 10.0
So yes I think it really is preferrable to not have a 9.3