The real issue is that of nomenclature. If you are a professional software developer (ST target audience) then you are careful about how you use a #1 development tool that calls itself "unstable". It implies certain things about whether it is a good idea to install on a mission-critical server for example, or whether it is a good idea to invest time in writing plugins against its API.

The product itself may be relatively bug-free, but that is not really the issue. RHEL7Beta was relatively bug-free, but I would not advise you to use it for most purposes.