Pros/Cons for a Seperate ASM Archivelog Disk Group

We have a non-ASM best practice of having our archivelogs on their own filesystem. When there is a major problem that fills up this space the datafiles (separate filesystem) themselves are not affected and the backup area used by RMAN (separate filesystem) is fully functional to perform archivelog sweeps.
My DBA team and I have the same concern about having the archivelogs in the FRA along with backups, etc., in the ASM. We are proposing a third disk group just for archivelogs. Also a best practice of always having at least 1 spare disk available that can be added to a disk group in an emergency.
Is there a reason why this is not a good idea or unnecessary? My team is new to ASM and I don't pretend to understand all the real world intracies of Oracle managing the FRA space/archivelogs/rman backups/etc.Thanks for any insight you can offer.

I have read and am quite aware of Oracle's recommendations and have been an Oracle DBA since the venerable 7.0.16 release. In fact I have read through some 20 or so related Oracle white papers concerning ASM. However, in the 24 years I have been working with databases I am also well aware things don't always go as planned. You will fill up a disk group eventually whether that is from unexpectedly high data activity, human error, monitoring being down or any number of possibilities.
So if we make the assumption that the FRA disk group will be out of space due to excessive numbers of archivelogs and/or RMAN retention widow and backup growth problems how do we quickly solve the issue while my prod DB is unavailable? Ah the real world ... If archivelogs and backups are in the FRA I really only have three choices, 1. add a disk to the disk group if I have one, or 2. manually delete files thus potentially impacting recoverability or 3. possibly temporarily reducing my RMAN recovery window to allow RMAN to clean out "old" backup sets (thus impacting my SLA recovery window. Yes there are probably other variations on these also.
Therefore, we are proposing having a best practice of a spare disk available and a seperate disk group for archivelogs so we have two potential methods to recover from this scenario. Now back to the original question, is there a reason why a seperate disk group for archivelogs is not a good idea or unnecessary?
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