Why is haproxy reloading an issue ? It works pretty well in my experience (although I am not in the web business anymore, so things may have changed in the last two years).
Reloading is no issue when you have few frontends or backends. But when you have a lot of front- or backends, the configuration file will be huge, and reloading will take some time. If you need to reload every few seconds, this might even cause downtime. But I guess our workload is not the usual implementation of HAProxy...
"But when you have a lot of front- or backends, the configuration file will be huge, and reloading will take some time. If you need to reload every few seconds..."