IP Stream identification (clause 6.7) is focused on layer 3 "streams". As such it uses the IP Destination Address to identify the stream. It also requires a MAC address to be specified as well.
I would suggest that replacement equipment that is going to be swapped in will likely have its IP address assigned to it before it is swapped in, but it’s MAC address will (almost) never match.
Here's my justification: a Pro Audio system controller expects every device in that system to have a unique IP address. If a device fails, its replacement is assigned the same IP address so the controller can find, monitor, and configure it. Therefore, when using IP addressing, it is often the case that the IP address is as unique to a device as is the MAC DA. Forcing the bridges in this failure case to be reconfigured for the new MAC DA when replacement equipment in installed (since that is currently required in CB-2017) seems to put an unnecessary burden on system management. Just let them swap in a new end station.
See slide 16 of http://www.ieee802.org/1/files/public/docs2019/maint-cgunther-CBitems-0519-v01.pdf for details about required vs optional parameters associated with IP Stream identification.
Suggestion is to make the destination MAC address optional. Note that the IP Destination address is still required.