Yes I remember looking at this too some years back, I just thought at some point that going to stakeholders and propose a Meraki solution that needs Aruba for monitoring would raise some eyebrows, at least TE is Cisco from this point of view, but if nothing comes forward I will consider these Aruba sensors, I like them.
At least I can sell the fact that having another vendor running monitoring should legitimate the solution even more, hoping they accept that operations may have to look at two dashboards