Hello @Sam Na !
Your questions are valid , allow me to help !
- Usually for the reason of central management and configuration it i better to manage global settings rather than specifics. Unless your needs instruct otherwise better stay inherited
- For an Azure VM we never touch the NIC setting. It is a SOS !
- Yes , Azure DNS is perfectly fine for a standard DNS resolver , unless you have specific needs via VPN , On Prem Applications.
Keep in mind it is not a one size fits all ! Your needs are setting the stage !
Reference Links
https://learn.microsoft.com/en-us/azure/architecture/hybrid/hybrid-dns-infra
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I hope this helps!
Kindly mark the answer as Accepted and Upvote in case it helped! Regards