https://blog.meraki-go.com/2022/02/16/small-businesses-stop-getting-wifi-from-your-isp/
1. Security.
If you take security seriously, you should also be faster to aknowledge and fix vulnerabilities than the average home router device manufacturer:
https://community.meraki.com/t5/Questions-and-Answers/Meraki-Go-affected-by-DNSpooq/m-p/132117#M776
5. Troubleshooting
Meraki Go does not replace the ISPs modem, so the scenario you are describing might still happen. This is misleading advertisement at best.