From a Google search:
Converting basic disks to dynamic disks can help achieve improved performance in your Windows OS. However, there are compatibility restrictions you should be aware of before diving into this conversion process.
https://searchenterprisedesktop.techtarget.com/tip/When-not-to-convert-basic-disks-to-dynamic-disksThe link requires registration.
In brief, he makes these points:
1. Can not downgrade the OS
2. Do not use with multi-boot
3. Not for removable storage.
4. Possible legacy software issues.
The last point is not covered other than to state there is an issue with the FAT. If yu have a utility program that wants to modify the FAT, it will fail.
That is the limit of what I have found.