Hi If you use bia instead of the virtual mac.. as pointed out by Prem, the router will use its ethernet mac address for the arp request from the hosts.
I would see the use in one case that if you are using port security on your switch where you have your both the routers connected and in that case if the virtual mac is learned on one port and you router goes down but the secure table still has your mac in its table.Now when the host makes and arp request again for the gateway and the new active router will send its virtual mac as the reply. Now this MAC is already on the switch's secure table and it will put the port connected to new router into error disable statr. If you have tis kind of situation you can use " standby use-bia" command to come out of this situation.
If you are using a single group, the only negative point is that you cannot do the load-balancing whihc is done in case of multiple HSRP groups. Moreover it is easy to manage and troubleshoot the multiple HSRP group.
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