Now would I recommend continuing to run end of support gear for a long time? No, because it limits your ability to upgrade firmware to address bugs, security vulnerabilities, feature enhancements, etc. And with devices like APs older hardware wasn't as powerful as modern hardware and can also limit your performance, client density, etc.
The official position on this is located here https://meraki.cisco.com/meraki-support/policies/#product-end-of-life-eol-policy
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