1) Why would you - as a company, Cisco / Meraki in this regard - build in support for a competing product? Umbrella is going to be a "real" Securite Internet Gateway (SIG) very soon and definitely will add more security to the stack than zScaler - depending on which feature you're looking at. At least zScaler will never be able to have that vast pool of information regarding DNS security. 2) Of course you can further toot the "we need to decrypt everything that's encrypted"-horn. At some point in the future you'll (hopefully) find that it simply doesn't work and creates more burden and problems that you're trying to solve. But I guess this is getting more or less religious here. I can only second what @PhilipDAth wrote, and he did it way better than I could.
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