Well, inner-ear infections impacting balance is not exactly news
But yes - the linkage across these things is interesting. Its certainly a bit of a mystery to me why they were reluctant to make the referral. Than again, we were on the edge of the timeline when it would be considered a developmental delay and likely came across as anxious Type-A's so she may have just assumed we were overly worried.
That said, having now looked into it, I'm wildly unimpressed with the quality of the science behind "developmental milestones" (note - not discussing formal evaluations, just the "Kids should walk by X age" checklists pediatricians and the like follow). Standard deviations are so large that most seem almost useless. Not to mention the fact that so many toddler behaviors are somewhat...open to interpretation
I assumed we had the science on this fairly locked down by now, but we very much do not.
Becoming a parent has certainly opened my eyes to exactly how limited the science is on many early childhood topics. Don't even get me started on the breastfeeding literature.