Load balancers are particularly useful when it comes to cloud applications because they let you keep your routing logic server-side, meaning that you can make a

Load balancers are particularly useful when it comes to cloud applications because they let you keep your routing logic server-side, meaning that you can make adjustments quickly without needing to release a new client version. Your load balancer definitely shouldn't be a bottleneck - you can deploy multiple LBs to handle the traffic and provide redundancy, though you need to use other methods to balance between them (DNSRR, anycast, etc).