My wife and I have a shared id account and only run one calendar, reminders, etc. This hasn’t caused any particular problems over last 20 years but every so often, such as when a facetime call is received and it rings on all our devices, I ponder whether we should set up separate id’s and family sharing but I really don’t understand what the implications of doing this might be and don’t want to hit any unforeseen problems
If you've done well doing what you are doing, then I'd leave it alone. But, here is the alternative. One of you would need to create a new Apple ID.
See See How to create a new Apple ID https://support.apple.com/en-us/HT204316. See the data implications below.
Some of these things should be done even though not changing Apple ID: What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071
Keep in mind that some things available under a first Apple ID will not be available under a new Apple ID. For example, you won’t be able to transfer anything purchased from the App and iTunes Stores to the new ID. And, there are other issues to be addressed.
And see what Eric Root says on this matter here https://discussions.apple.com/thread/251343949 and
what Winston Churchill says about it here: https://discussions.apple.com/thread/7452747
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As you mention, you also can set up family sharing between the IDs to share purchases made with them on different devices. See:
Family Sharing https://support.apple.com/en-us/HT201060
Set up Family Sharing https://support.apple.com/en-us/HT201088
If you've done well doing what you are doing, then I'd leave it alone. But, here is the alternative. One of you would need to create a new Apple ID.
See See How to create a new Apple ID https://support.apple.com/en-us/HT204316. See the data implications below.
Some of these things should be done even though not changing Apple ID: What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071
Keep in mind that some things available under a first Apple ID will not be available under a new Apple ID. For example, you won’t be able to transfer anything purchased from the App and iTunes Stores to the new ID. And, there are other issues to be addressed.
And see what Eric Root says on this matter here https://discussions.apple.com/thread/251343949 and
what Winston Churchill says about it here: https://discussions.apple.com/thread/7452747
__________
As you mention, you also can set up family sharing between the IDs to share purchases made with them on different devices. See:
Family Sharing https://support.apple.com/en-us/HT201060
Set up Family Sharing https://support.apple.com/en-us/HT201088
If you switch to 2 IDs, you will need to get/use 3rd party software to continue sharing some items, such as Contacts.
You can share a Calendar on iCloud.
For photos.
How does the Health App work? I have set up emergency contact on my phone and all my wife's information on her phone has been changed to my details. Is this how the Health App works that you can't have more than one person using a health app under one Apple ID?
That could be a big negative
Does anybody know a good contacts app that could be shared between two Apple ID accounts?
Shared or separate id accounts
