Other solutions do have this limiting factor so it's a big plus for professional use :o
We routinely run high bitrate, high quality video and have no issues. The limiting factor is usually bandwidth at the transmit or receive sites.
I've hammered Wowza with a 40mbps transport streams and had folks on Verizon Fios watching with no issues. We routinely connect a handful of Insert Studio's around using our Wowza servers, they're usually sending us 720p60 at around 10-15mbps all day/night.