That I've been deeply involved in the design and implementation of both hardware and software for 40 years and know nothing about it, and don't know anyone in the industry who does either, is a comment on the $16B evaluation. Companies thrive on the needs and wants of people which is why Coke and Google and Microsoft stock prices are so high and maintain those levels. I don't find want and need for Slack among anyone I know. A small space but the same people have heard of and use Coke, Microsoft and Google.