I currently have to reboot 50 WAPs every morning at one of my sites. On a touchscreen computer or tablet, it's pretty easy to do it fast as long as you aren't using the Meraki app. Usually takes me maybe 2 minutes to cycle through them all. In the online portal, select the first one and then use the 'Next' arrow to speed through. Next > Tools > Reboot > Yes
Rinse and repeat.
Not everybody uses Meraki Switches throughout their LAN. It would be impractical for me to reboot the 15 Cisco switches that drive each WAP cluster.
Someone mentioned to me in another thread that there may been an API to use for this function, but I haven't had the chance to look into it yet.