Giving access to lots of information actually often makes customers' working lives much more complex. If you have an issue, your license allows you to contact Meraki Support - let them worry about the complexity of (for example) When does CPU utilisation become excessive? Meraki is pretty obsessive about making technology as simple as possible.
(BTW - if you haven't found it before, Meraki makes available an overall MX appliance utilisation number, under Organization > Summary report)