I use my Kemper both on the road and in the studio, just like a real amp. In fact it has improved our live sound because of less spill on stage sound-wise. Many of us have spent plenty in buying the unit and I find it a bad idea to put out a plug-in that would soon be around for nothing.
For writing demos I have good enough sounds on Amplitude and other plugins. Also the final record should always feel like an improvement over the demo.