As you realized, the tooling will build all target platforms. Also, k10 is a whole new target platform and only a very small subset of existing packages will work with it. Everything needs to be recompiled to work with the new profile so yes it's expected.
David Fowler
Principal SDE, ASP.NET Team, Microsoft
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Microsoft
Re: project.json dependencies, dependencies, dependencies
Jun 17, 2014 02:04 AM|davidfowl|LINK
As you realized, the tooling will build all target platforms. Also, k10 is a whole new target platform and only a very small subset of existing packages will work with it. Everything needs to be recompiled to work with the new profile so yes it's expected.
Principal SDE, ASP.NET Team, Microsoft