The advantage of using SRV records with consul, is that any load-balancer supporting SRV can replace any loadbalancer already in place, almost seamlessly :) This applies to any Service Registry (I tested the feature with both Kubernetes and Consul)

So yes, this feature was missing in HAProxy and we catched up because our community and some customers asked for it. So they can now use the power of HAProxy with their current consul deployments.