Yes Please replace as new developments will not be done on the MX65 as they are part of End of life devices and may get you more vulnerabilities in future in case you stayed with MX65.
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Yes it will stay active, Keep this below link handy as well https://documentation.meraki.com/MX/Site-to-site_VPN/Meraki_Auto_VPN_-_Configuration_and_Troubleshooting
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The Ans is Yes Official doc : https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-11/release_notes/ol-16-11-9300.html
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People shared issue related to this version , may be support call if something triggered https://community.meraki.com/t5/Security-SD-WAN/MX-18-208-release-being-pushed-Performance-improvements-added-to/m-p/225158
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Here you go https://documentation.meraki.com/MX/NAT_and_Port_Forwarding/Blocking_Inbound_Traffic_on_MX_Security_Appliances https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/MX_Firewall_Settings
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