[jbob2000]

Well that's my point. If you don't have the time to convert your design system, then you might as well stick with PS until you do. You'd just be using Sketch as PS-Lite. It's not a "cheap PS" or a PS-lite, it's a tool for a new system of design.

It would be like using JIRA for Waterfall development. Sure, you can do that, but that's not really the point of JIRA...

[Raphmedia]

Consider the use case where the designer doesn't have PS but receive a bunch of third party .PSD files.

[striking]

You can incrementally convert your design system. Doing it all at once could be difficult to justify to some pointy-haired bosses.