If MSGraphClient is in preview and should not be used in a production environment, and the "GraphHttpClient has been deprecated and should no longer be used" ... which should be used given SPFx v1.4.1? Is the MSGraphClient really still in preview?
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Deprecation means that we are not investing in it anymore, but it's still supported. It's true that we are in transition to a new model and we openly want to communicate this direction in the documentation to avoid any surprises. MSGraphClient is still in preview and we'll talk about the updated timelines on that one in Build 2018 and in SPC 2018. We will absolutely update this documentation when the situation changes.
MSGraphClient is officially launched now in November 2018
https://docs.microsoft.com/en-us/sharepoint/dev/spfx/use-msgraph
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Deprecation means that we are not investing in it anymore, but it's still supported. It's true that we are in transition to a new model and we openly want to communicate this direction in the documentation to avoid any surprises. MSGraphClient is still in preview and we'll talk about the updated timelines on that one in Build 2018 and in SPC 2018. We will absolutely update this documentation when the situation changes.